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The crystal and molecular structure of lisuride hydrogen maleate

Published/Copyright: July 28, 2010

Abstract

The structure of the semisynthetic ergot derivate – lisuride hydrogen maleate (C20H27N4O)+ · (C4H3O4) was solved by direct methods and refined anisotropically to an R value of 0.053 for 1618 unique observed reflections. The title compound crystallizes in the monoclinic space group P21 with lattice parameters a = 11.968(3) Å, b = 5.754(2) Å, c = 17.311 (5) Å, β = 107.15(2)°, Z = 2. The lisuride molecule exhibits a great flexibility; the indole moiety of A and B rings of an ergoline fragment is slightly puckered only. Ring C has a 1E envelope conformation and ring D has a 1H2 half-chair one. Lisuride-maleate interaction is mediated both through electrostatic forces and H-bridges.

Published Online: 2010-7-28
Published in Print: 1994-4-1

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