Acta Cryst. (2005). E61, o726-o728  [ doi:10.1107/S1600536805004903 ]

A second polymorphic form of pentazocine hydrochloride at 105  K

A. Mostad

Abstract: The crystal structure of pentazocine hydrochloride [systematic name: 2-hydroxy-5,9-dimethyl-2-(3-methylbuten-2-yl)-6,7-benzomorphanium chloride], C₁₉H₂₈NO⁺·Cl^-, has been determined at 105  K and found to be a second polymorphic form with space group C2/c. The space group and the unit-cell parameters are different from a reported crystal structure at 293  K [Majeste, Poindexter, Jones & Klein (1994). Acta Cryst. C50, 1633-1636]. There are only small differences in the molecular conformation, but the association between the protonated pentazocine molecules and the chloride ion is different.

Online 19 February 2005

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