Chasmaconitine 0.5-Methanol Solvate

The crystal structure of chasmaconitine methanol solvate, C₃₄H₄₇NO₉.0.5CH₄O, a C₁₉ diterpenoid alkaloid isolated from the roots of Aconitum chasmanthum Stapf ex Holmes of Pakistani origin contains discrete molecules separated by normal van der Waals distances. The fused ring system contains one boat, one half-chair, two envelope and two chair conformations. The molecular dimensions are normal with no interactions between the alkaloid and the disordered solvate molecules; the mean bond distances are C_sp³-N 1.467 (14), C_sp³-C_sp³ 1.54 (2), C_sp³-O 1.42 (2), C_sp²-O 1.337 (5) and C=O 1.197 (5) Å.

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