Acta Crystallographica Section E: Crystallographic Communications (May 2016)

Crystal structure of levomepromazine maleate

  • Gyula Tamás Gál,
  • Nóra Veronika May,
  • Petra Bombicz

DOI
https://doi.org/10.1107/S2056989016004916
Journal volume & issue
Vol. 72, no. 5
pp. 612 – 615

Abstract

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The asymmetric unit of the title salt, C19H25N2OS+·C4H3O4− [systematic name: (S)-3-(2-methoxyphenothiazin-10-yl)-N,N,2-trimethylpropanaminium hydrogen maleate], comprises two (S)-levomepromazine cations and two hydrogen maleate anions. The conformations of the two cations are similar. The major difference relates to the orientation of the methoxy substituent at the phenothiazine ring system. The crystal components form a three-dimensional supramolecular network via N—H...O, C—H...O and C—H...π interactions. A comparison of the conformations of the levomepromazine cations with those of the neutral molecule and similar protonated molecules reveals significant conformational flexibility of the phenothiazine ring system and the substituent at the phenothiazine N atom.

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