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The structure of the semisynthetic ergot derivate – lisuride hydrogen maleate (C 20 H 27 N 4 O) +  · (C 4 H 3 O 4 ) −  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  P 2 1  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  1 E envelope conformation and ring D has a  1 H 2  half-chair one. Lisuride-maleate interaction is mediated both through electrostatic forces and H-bridges.

The crystal and molecular structure of lisuride hydrogen maleate