A new solvate of epalerstat, a drug for diabetic neuropathy

Okky Dwichandra Putra, Daiki Umeda, Kaori Fukuzawa, Mihoko Gunji, Etsuo Yonemochi

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


Epalerstat {systematic name: (5Z)-5-[(2E)-2-methyl-3-phenylprop-2-en-1-ylidene]-4-oxo-2-sulfanylidene-1,3-thiazolidine-3-acetic acid} crystallized as an acetone monosolvate, C15H13NO3S2·C3H6O. In the epalerstat molecule, the methylpropylenediene moiety is inclined to the phenyl ring and the five-membered rhodamine ring by 21.4 (4) and 4.7 (4)°, respectively. In addition, the acetic acid moiety is found to be almost normal to the rhodamine ring, making a dihedral angle of 85.1 (2)°. In the crystal, a pair of O - H⋯O hydrogen bonds between the carboxylic acid groups of epalerstat molecules form inversion dimers with an R22(8) loop. The dimers are linked by pairs of C - H⋯O hydrogen bonds, enclosing R22(20) loops, forming chains propagating along the [101] direction. In addition, the acetone molecules are linked to the chain by a C - H⋯O hydrogen bond. Epalerstat acetone monosolvate was found to be isotypic with epalerstat tertrahydrofuran solvate [Umeda et al. (2017). Acta Cryst. E73, 941-944].

Original languageEnglish
Pages (from-to)1264-1267
Number of pages4
JournalActa Crystallographica Section E: Crystallographic Communications
Publication statusPublished - 2017


  • acetone
  • crystal structure
  • epalerstat
  • hydrogen bonding
  • isotypic
  • monosolvate


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