Home Physical Sciences Ultrasound-assisted green synthesis and in silico study of 6-(4-(butylamino)-6-(diethylamino)-1,3,5-triazin-2-yl)oxypyridazine derivatives
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Ultrasound-assisted green synthesis and in silico study of 6-(4-(butylamino)-6-(diethylamino)-1,3,5-triazin-2-yl)oxypyridazine derivatives

  • Tiruhi Gomktsyan , Angelina Khachatryan , Diana Avakyan , Lernik Hunanyan , Roza Shainova , Armen Karapetyan , Emma Ghazaryan , Asya Vorskanyan , Margarita Dovlatyan , Yana Gharibyan , Aleksandr Yengoyan EMAIL logo and Vergush Pivazyan
Published/Copyright: November 10, 2023
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Abstract

Eco-friendly ultrasound-assisted synthesis of a series of 3-N-substituted 6-((4-(butylamino)-6-(diethylamino)-1,3,5-triazin-2-yl)oxy)pyridazin-3(2H)-one derivatives and in silico study to predict their biological activities were carried out. Physicochemical and pharmacokinetic properties were obtained. Absorption, distribution, metabolism, excretion and toxicity properties and bioavailability index were calculated. A comparative analysis of structural similarity based on the Tanimoto coefficient was carried out.

Graphical abstract

1 Introduction

Heterocyclic compounds containing a symmetrical 1,3,5-triazine moiety are an interesting class of compounds with a wide spectrum of biological activity. In medical practice, several drugs are used: the respiratory stimulant almitrin (duxil), the antitumor drugs altretamine (hexalen), dioxadet and tretamine, the myorelaxant isocyuronium bromide, the trypanocidal drugs melarsen oxide and melarsomine, the antimalarial drug cycloguanil, and the antiulcer drug irsogladine.

Given the breadth of the spectrum of physiological action, targeted syntheses and studies of the biological activity of new derivatives of 1,3,5-triazine continue. This series includes compounds with antimicrobial [1,2,3,4], anti-tuberculosis [5,6], anti-inflammatory [7,8], antiviral [9], antifungal [10], anticancer [11,12,13,14], anti-HIV [15,16], antitrypanosomal [17,18], and antimalarial [19,20,21] activities. Some derivatives of 1,3,5-triazine inhibit monoamine oxidase [22] and are blockers of neuronal sodium channels [23].

Much attention is also paid to the search for new biologically active derivatives of pyridazine. In the last two decades, among them, the compounds with analgesic and anti-inflammatory [24,25], antimicrobial [26,27,28], antifungal [29], antitumor [30,31], and antinociceptive [32] activities have been found. Some substances have shown inhibitory effects on α1-α2-adrenoceptors [33], c-Met kinase [34], and plant growth [35].

Derivatives of 1,3,5-triazine and pyridazine are also widely used in agriculture. Among the 1,3,5-triazine derivatives, fungicides (anilazine), and herbicides (dipropetryn, trihydroxy triazine, a large number of substituted chlorotriazines, fluoroalkyltriazines, methoxytriazines, methylthiotriazines, triazinones, and also a wide number of triazinylsulfonylurea derivatives) are known [36].

The arsenal of pesticides based on pyridazine includes mainly herbicides (credazune, pyridafol, pyridate, brompyrazon, chloridazon, dimidazon, flufenpyr, metflurazon, norflurazon, oxapyrazon, and pudanon) [36]. Our early studies also identified compounds that have a stimulating effect on plant growth [37,38,39,40].

However, the acquisition by harmful organisms of resistance to the substances used necessitates a systematic replenishment of their assortment with new drugs with different mechanisms of action.

In this regard, the purpose of this study was the targeted synthesis of new compounds with a combination of 1,3,5-triazine and pyridazine cycles in the molecule, which can lead to new biologically active derivatives, to which the indicated resistance has not yet been formed.

2 Materials and methods

2.1 General

An ultrasonic generator I10-840 with an operating frequency of 22 kHz ± 10% and a maximum pulse power of 1,000 W was used to carry out the sonochemical syntheses. In all experiments, the following conditions were applied: irradiation power – 30% (300 W), exposure time – 30 min. The vessel with the reagents subjected to irradiation was placed in a water bath, which was maintained at room temperature (25°C).

The structure and purity of the compounds synthesized were confirmed by 1H and 13C NMR spectra, obtained at 30°C on a Varian Mercury-300 NMR spectrometer (300 and 75 MHz, respectively) in a mixture of CCl4/DMSO-d6 solvents (3:1), using a standard pulse sequence; TMS was used as an internal standard. The progress of the reactions and the purity of the obtained compounds were checked by TLC on Silufol UV-254 plates; an acetone/hexane mixture (2:1 or 1:1) was used as the eluent. Elemental analysis was performed on a Eurovector EA3000 CHN analyzer. Melting points were determined on a Stuart SMP10 apparatus and were uncorrected.

2.2 US-assisted syntheses of compounds 2–9

2.2.1 6-((4-(Butylamino)-6-(diethylamino)-1,3,5-triazin-2-yl)oxy)pyridazin-3(2H)-one (2)

The mixture of compound 1 (0.02 mol), and potassium salt of 6-hydroxypyridazin-3(2H)-one (0.02 mol) in 20 mL of DMF was subjected to ultrasound irradiation. Yield 83%, m.p., 160–161°C. IR, ν, cm−1: 1,676 (C═O). 1H NMR, δ, ppm (J, Hz): 0.95 (3H, t, J = 7.1, CH 3-Bu); 1.10–1.20 (6H, t, J = 7.1, (CH3)2-Et); 1.33 and 1.50 (4H, m, CH2CH2); 3.20 and 3.24 (2H, m, CH 2 NH); 3.40–3.58 (4H, m, (NCH2)2-Et); 6.82 and 7.20 (2H, d, J = 9.0, CH═CH); 6.80 and 7.50 (1H, brs, NH-Bu); 12.45 (1H, brs, NH-pyrid.). 13C NMR, δ, ppm: 12.6, 12.9, 13.0, 13.4, 13.5, 19.38, 19.45, 19.5, 30.8, 31.5, 40.1, 40.3, 40.8, 40.9, 130.5,130.8, 148.2, 159.8, 164.8, 166.0, 169.0. Anal. calculated for C15H23N7O2: C, 54.04; H, 6.95; N, 29.41. Found: C, 54.14; H, 6.90; N, 29.55.

2.2.2 6-((4-(Butylamino)-6-(diethylamino)-1,3,5-triazin-2-yl)oxy)-2-methylpyridazin-3(2H)-one (3)

The mixture of compound 1 (0.02 mol) and potassium salt of 6-hydroxy-2-methylpyridazin-3(2H)-one (0.02 mol) in 20 mL of DMF was subjected to ultrasound irradiation. Yield, 75%; m.p., 133–135°C. IR, ν, cm−1: 1,667 (C═O). 1H NMR, δ, ppm (J, Hz): 0.95 (3H, t, J = 7.1, CH 3-Bu); 1.12–1.20 (6H, t, J = 7.1, (CH3)2-Et); 1.32 and 1.50 (4H, m, CH2CH2); 3.19 and 3.24 (2H, m, CH 2NH); 3.43 and 3.55 (4H, m, (NCH2)2-Et); 3.60 (3H, s, NCH3); 6.25 and 7.18 (1H, t, J = 4.8, NH); 6.90 and 7.23 (2H, d, J = 9.0, CH═CH). 13C NMR, δ, ppm: 12.76, 12.83, 13.4, 19.4, 30.8, 38.7, 39.7, 40.8, 40.9, 130.0, 146.9, 147.40, 158.5, 164.8, 166.0, 169.0. Anal. calculated for C16H25N7O2: C, 55.31; H, 7.25; N, 28.22. Found: C, 55.25; H, 7.20; N, 28.11.

2.2.3 6-((4-(Butylamino)-6-(diethylamino)-1,3,5-triazin-2-yl)oxy)-2-phenylpyridazin-3(2H)-one (4)

The mixture of compound 1 (0.02 mol) and potassium salt of 6-hydroxy-2-phenylpyridazin-3(2H)-one (0.02 mol) in 20 mL of DMF was subjected to ultrasound irradiation. Yield, 65%; m.p., 162–164°C. IR, ν, cm−1: 1,679 (C═O). 1H NMR, δ, ppm (J, Hz): 0.95 (3H, t, J = 7.1, CH 3-Bu); 1.12–1.20 (6H, t, J = 7.1, (CH3)2-Et); 1.32 and 1.50 (4H, m, CH 2CH2); 3.20 and 3.25 (2H, m, CH2NH); 3.44 and 3.57 (4H, m, (NCH2)2-Et); 6.91 and 7.23 (1H, t, J = 4.8, NH); 7.00–7.71 (7H, m, C6H5 and CH═CH). 13C NMR, δ, ppm: 12.6, 12.9, 13.4, 19.4, 30.8, 39.7, 40.8, 41.0, 124.4, 126.9, 127.8, 130.1, 131.7, 140.7, 148.2, 157.9, 164.8, 166.1, 169.0. Anal. calculated for C21H27N7O2: C, 61.60; H, 6.65; N, 23.94. Found: C, 61.8; H, 6.69; N, 24.02.

2.2.4 6-((4-(Butylamino)-6-(diethylamino)-1,3,5-triazin-2-yl)oxy)-2-propylpyridazin-3(2H)-one (5)

The mixture of compound 2 (0.02 mol), KOH (0.02 mol), and propylbromide (0.022 mol) in 20 mL of DMF was subjected to ultrasound irradiation. Yield, 71%; m.p., 95–97°C. IR, ν, cm−1: 1,672 (C═O). 1H NMR, δ, ppm (J, Hz): 0.96–1.23 (12H, m, (CH3)4); 1.27–1.57 (4H, m, CH2CH2); 1.76 (2H, m, CCH2C-Pr); 3.18 and 3.25 (2H, m, CH 2 NH); 3.43 and 3.55 (4H, m, (NCH2)2-Et); 3.96 (2H, t, J = 7.2, NCH2-Pr); 6.80 and 7.18 (1H, t, J = 4.8, NH); 6.84 and 7.20 (2H, d, J = 9.0, CH═CH). 13C NMR, δ, ppm: 10.5, 12.6, 12.8, 13.4, 19.36, 19.44, 20.9, 29.0, 30.8, 31.1, 36.7, 40.5, 40.8, 41.0, 51.7, 129.6, 129.9, 130.2, 130.5, 130.7, 147.4, 148.2, 158.3, 159.7, 164.7, 166.1, 169.0. Anal. calculated for C18H29N7O2: C, 57.58; H, 7.79; N, 26.11. Found: C, 57.66; H, 7.84; N, 26.27.

2.2.5 6-((4-(Butylamino)-6-(diethylamino)-1,3,5-triazin-2-yl)oxy)-2-ethylpyridazin-3(2H)-one (6)

The mixture of compound 2 (0.02 mol), KOH (0.02 mol), and ethyliodide (0.022 mol) in 20 mL of DMF was subjected to ultrasound irradiation. Yield, 72%; m.p., 120–122°C. IR, ν, cm−1: 1,666 (C═O). 1H NMR, δ, ppm (J, Hz): 0.96 (3H, t, J = 7.1, CH 3-Bu); 1.10–1.20 (6H, t, J = 7.1, (CH3)2-Et); 1.30 (3H, t, J = 7.0, NCH2CH 3-Et); 1.27–1.57 (4H, m, CH2CH2); 3.20 and 3.27 (2H, m, CH 2NH); 3.43 and 3.55 (4H, m, (NCH2)2-Et); 4.03 (2H, q, J = 7.0, NCH2-Et); 6.92 and 7.20 (1H, t, J = 4.8, NH); 6.94 and 7.22 (2H, d, J = 9.0, CH═CH). 13C NMR, δ, ppm: 12.6, 12.8, 12.9, 13.3, 19.4, 30.8, 40.8, 41.0, 45.4, 129.7, 130.2, 147.6, 158.0, 164.7, 166.1, 169.0. Anal. calculated for C17H27N7O2: C, 56.49; H, 7.53; N, 27.13. Found: C, 56.40; H, 7.47; N, 27.01.

2.2.6 2-(3-((4-(Butylamino)-6-(diethylamino)-1,3,5-triazin-2-yl)oxy)-6-oxopyridazin-1(6H)-yl)acetamide (7)

The mixture of compound 2 (0.02 mol), KOH (0.02 mol), and 2-chloroacetamide (0.022 mol) in 20 mL of DMF was subjected to ultrasound irradiation. Yield, 87%; m.p., 188–190°C. IR, ν, cm−1: 1,676 (C═O), 1,680 (C═O). 1H NMR, δ, ppm (J, Hz): 0.96 (3H, t, J = 7.2, CH 3-Bu); 1.11 and 1.17 (6H, t, J = 7.1, (CH 3)2-Et); 1.35 and 1.50 (4H, m, CH2CH2); 3.20 and 3.25 (2H, m, CH2NH); 3.43 and 3.55 (4H, m, (NCH2)2-Et); 4.53 (2H, s, NCH2CO); 7.32 (1H, t, J = 6.0, NH); 6.91 and 7.26 (2H, d, J = 9.8, CH═CH); 6.93 and 7.36 (2H, brs, NH2). 13C NMR, δ, ppm: 12.7, 12.9, 13.4, 19.5, 30.8, 40.76, 40.78, 40.94, 130.2, 130.3, 147.5, 158.5, 164.8, 166.0, 167.4, 168.8. Anal. calculated for C17H26N8O3: C, 52.30; H, 6.71; N, 28.70. Found: C, 52.22; H, 6.76; N, 28.81.

2.2.7 Methyl 2-(3-((4-(butylamino)-6-(diethylamino)-1,3,5-triazin-2-yl)oxy)-6-oxopyridazin-1(6H)-yl)acetate (8)

The mixture of compound 2 (0.02 mol), KOH (0.02 mol), and methyl 2-chloroacetate (0.022 mol) in 20 mL of DMF was subjected to ultrasound irradiation. Yield, 70%; m.p., 93–95°C. IR, ν, cm−1: 1,683 (C═O), 1,751 (C═O). 1H NMR, δ, ppm (J, Hz): 0.93 (3H, t, J = 7.1, CH 3-Bu); 1.12–1.20 (6H, t, J = 7.1, (CH3)2-Et); 1.34 and 1.50 (4H, m, CH2CH2); 3.20 and 3.25 (2H, m, CH2NH); 3.42 and 3.53 (4H, m, (NCH2)2-Et); 3.77 (3H, s, OCH3); 4.72 (2H, s, NCH2CO); 6.85 and 7.25 (1H, t, J = 5.0, NH); 6.93 and 7.33 (2H, d, J = 9.0, CH═CH). 13C NMR, δ, ppm: 12.3, 12.6, 13.1, 19.1, 30.5, 39.8, 40.5, 40.6, 40.7, 51.3, 51.7, 129.9, 130.7, 147.6, 158.0, 164.4, 165.8, 166.5, 168.5. Anal. calculated for C18H27N7O4: C, 53.32; H, 6.71; N, 24.18. Found: C, 53.38; H, 6.77; N, 24.03.

2.2.8 Ethyl 2-(3-((4-(butylamino)-6-(diethylamino)-1,3,5-triazin-2-yl)oxy)-6-oxopyridazin-1(6H)-yl)acetate (9)

The mixture of compound 2 (0.02 mol), KOH (0.02 mol), and ethyl 2-chloroacetate (0.022 mol) in 20 mL of DMF was subjected to ultrasound irradiation. Yield, 68%; m.p., 68–70°C. IR, ν, cm−1: 1,676 (C═O), 1,761 (C═O). 1H NMR, δ, ppm (J, Hz): 0.95 (3H, t, J = 7.1, CH 3-Bu); 1.13–1.20 (6H, t, J = 7.1, (CH3)2-Et); 1.30 (3H, t, J = 7.1, OCH2CH 3); 1.34 and 1.50 (4H, m, CH2CH2); 3.21 and 3.24 (2H, m, CH 2 NH); 3.42 and 3.54 (4H, m, (NCH2)2-Et); 4.20 (2H, q, J = 7.1, OCH2 CH 3); 4.68 (2H, s, NCH2CO); 6.85 and 7.23 (1H, t, J = 5.0, NH); 6.93 and 7.33 (2H, d, J = 9.0, CH═CH). 13C NMR, δ, ppm: 12.6, 12.8, 13.3, 13.7, 19.4, 30.8, 39.7, 40.8, 40.9, 52.1, 60.5, 130.1, 130.9, 147.8, 158.3, 164.7, 166.0, 166.2, 167.8. Anal. calculated for C19H29N7O4: C, 54.40; H, 6.97; N, 23.37. Found: C, 54.39; H, 6.82; N, 23.17.

3 Results and discussion

3.1 Chemistry

The initial goal of this work was the target synthesis of triazinyloxypyridazines, which should be obtained by substituting the chlorine atom in the second position of 2-chloro-4-butylamino-6-diethylamino-1,3,5-triazine with an oxypyridazine fragment. However, taking into account that such a reaction proceeds under rather severe conditions, at first the chlorosubstituted derivative was transformed into 4-(butylamino)-6-(diethylamino)-N,N,N-trimethyl-1,3,5-triazine-2-aminium chloride (1) and then the subsequent reactions of latter were carried out with potassium salts of the previously obtained 6-hydroxypyridazin-3(2H)-one and its 1-methyl- and 1-phenyl substituted derivatives. As a result of these reactions, the corresponding triazinyloxypyridazines (2–4) were synthesized (Scheme 1).

Scheme 1 
                  Synthesis of triazinyloxypyridazine derivatives.
Scheme 1

Synthesis of triazinyloxypyridazine derivatives.

Compounds 3 and 4 can also be obtained from 6-((4-(butylamino)-6-(diethylamino)-1,3,5-triazin-2-yl)oxy)pyridazin-3(2H)-one (2). At the same time, the latter can exist in two different tautomeric forms, and, as a result, the substitution reactions can proceed both at the cyclic nitrogen atom (2A) or the oxygen atom of the hydroxyl group (2B). Compound 2 was alkylated with various alkyl halides (Scheme 2).

Scheme 2 
                  Synthesis of N-substituted derivatives of 6-((4-(butylamino)-6-(diethylamino)-1,3,5-triazin-2-yl)oxy)pyridazin-3(2H)-one (2).
Scheme 2

Synthesis of N-substituted derivatives of 6-((4-(butylamino)-6-(diethylamino)-1,3,5-triazin-2-yl)oxy)pyridazin-3(2H)-one (2).

In the IR spectra the absorptions at 1,672 cm−1 (compound 5) and 1,666 cm−1 (compound 6), corresponding to the C═O carbonyl groups were obtained, which is consistent with the substitution at the nitrogen atom of the pyridazine ring (A). In the IR spectra of compounds 7–9, for each compound, two absorptions related to the C═O groups are observed, which also indicates N-alkylation (A). The structure of compounds 5–9 is also confirmed by the 1H NMR and 13C NMR spectra, in which the chemical shifts of the signals of the alkyl substituents methylene groups are consistent with N-substitution.

It should be noted that the 1H NMR spectra of all synthesized compounds 2–9 contain two sets of signals corresponding to N-alkyl groups (4-butylamino and 6-diethylamino), which is explained by the hindered internal rotation around the N-heterocycle bond. The increase in the order of this bond is associated with the interaction of the p-electron orbital of the carbon atom of the triazine ring with the n-orbital of the exocyclic nitrogen atom. This effect was described in detail in our earlier article [41]. For this reason, the number of signals in the 13C NMR spectra of these compounds is greater than the number of carbon atoms in the molecule. The yield and melting points of synthesized compounds are listed in Table 1.

Table 1

Characteristics of synthesized compounds 2–9

No. Yield (%) m.p. (°C) No. Yield (%) m.p. (°C)
2 83 160–161 6 72 120–122
3 75 133–135 7 87 188–190
4 65 162–164 8 70 93–95
5 71 95–97 9 68 68–70

3.2 In silico study

Absorption, distribution, metabolism, excretion and toxicity (ADMET) parameter values were calculated using SwissADME [42] and ADMETlab v.2 [43] platforms. The prediction of possible toxicity was made using the AdmetSAR [44] and PeoTox [45] platforms. Possible biological activities were obtained based on PASS online [46]. Structural similarity parameters based on the Tanimoto coefficient and data clustering were performed using the online platform http://chemmine.ucr.edu/ (Figure 1).

Figure 1 
                  Map of the absorption of compounds through the GIT and BBB. BBB – passage through the BBB, HIA – absorption through the GIT, red dots – active transport, blue dots – passive transport.
Figure 1

Map of the absorption of compounds through the GIT and BBB. BBB – passage through the BBB, HIA – absorption through the GIT, red dots – active transport, blue dots – passive transport.

All studied compounds meet the criteria of Lipinski’s “Rule of Five” [47]. The calculated values of absorption through the gastrointestinal tract (GIT) and the blood–brain barrier (BBB) indicate that all compounds are well absorbed through the GIT while showing negative values of passage through the BBB. Permeability through the skin is also low at −6.21 cm·s−1.

It is known that the methodology that reveals the correlation between the structural features of compounds and their activity based on the similarity coefficient is one of the tools of modern drug design. By using QSAR and QSPR methods based on molecular fingerprints, it is possible to compare and group similar compounds in an “all-versus-all” comparison. Data clustering and its visualization simplify data analysis and increase the statistical validity of the experiment [48]. We carried out a comparative analysis and visualization of the structural similarity between the studied compounds. Our result shows that compounds 6 and 9 exhibit the maximum values of the Tanimoto coefficient of 60%.

Clustering based on structural similarity revealed three clusters: compounds 2–5 form cluster 1, 7–9 form cluster 2, and compound 6 forms cluster 3 (Figure 2).

Figure 2 
                  The resulting heat map of the similarity of molecular models based on the Tanimoto coefficient.
Figure 2

The resulting heat map of the similarity of molecular models based on the Tanimoto coefficient.

From the point of view of possible biological activity, the compounds included in cluster 2 exhibit an antianginal type of possible activity. Cluster 1 has a similar picture to cluster 2, except for compound 4, which may exhibit an inhibitory effect on the proteasome ATPase. In the studied series, only compound 6 appears to be a possible enhancer of HMGCS2 expression. It is known that such compounds are therapeutic agents for the treatment of malignant neoplasms of the GIT [49].

Prediction of toxicities based on mutagenicity, carcinogenicity, hepatotoxicity, and ecotoxicity revealed that all the studied compounds can exhibit mutagenicity and high hepatotoxicity. Ecotoxicity values obtained are above average for both pesticides and insecticides. The maximum value of 4.169 is observed for compound 2 with an acceptable standard of ≥11 μg [50]. For other compounds, the value varies from 5.151 to 5.681.

4 Conclusions

In summary, a sonochemical method for the synthesis of a series of novel 3-N-substituted 6-((4-(butylamino)-6-(diethylamino)-1,3,5-triazin-2-yl)oxy)pyridazin-3(2H)-one derivatives was carried out, which corresponds to the principles of “green chemistry.” Comparison of this technique with the traditional methods for the synthesis of the researched, as well as previously obtained compounds with a similar structure [51,52,53,54], shows that the reactions with ultrasonic activation of molecules proceed quickly and in high yields. Since industrial ultrasonic reactors exist, the synthesis of these potentially bioactive compounds can be carried out on a large scale, which will have a significant economic effect.

Based on the data of in silico analysis, the predicted diversity of the biological activity of the synthesized compounds was established. Our results show that the studied compounds show similar activity within the group. Compound 6 is different and appears to be a possible enhancer of HMGCS2 expression. From the point of view of possible toxicity, the studied compounds may have pesticidal and insecticidal properties.

  1. Funding information: This work was supported by the SCS of the Republic of Armenia within the framework of scientific project No. 21T-1D165.

  2. Author contributions: Tiruhi Gomktsyan, Vergush Pivazyan: conceptualization, data curation, validation, investigation, visualization, methodology; Angelina Khachatryan, Diana Avakyan: resources, software, formal analysis, visualization, methodology; Lernik Hunanyan: conceptualization, supervision, investigation, methodology, resources, software, formal analysis, visualization, writing – original draft; Roza Shainova, Armen Karapetyan, Emma Ghazaryan, Asya Vorskanyan: resources, data curation, formal analysis, validation, investigation, visualization, methodology; Siranush Harutyunyan, Yana Gharibyan: formal analysis, validation, investigation, visualization; Aleksandr Yengoyan: conceptualization, supervision, validation, investigation, methodology, writing – original draft, project administration, writing – review and editing.

  3. Conflict of interest: The authors state no conflict of interest.

  4. Data availability statement: The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.

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Received: 2023-06-02
Accepted: 2023-08-14
Published Online: 2023-11-10

© 2023 the author(s), published by De Gruyter

This work is licensed under the Creative Commons Attribution 4.0 International License.

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