Crystal and molecular structure of 17-β-methyl-α-isolupanine perchlorate

The formula of the title compound is C₁₆H₂₇ClN₂O₅,P2₁/a = 8.348(1),b = 10.127(1),c = 11.264(2) Å, = 116.42(1) °,Z = 2,D_x = 1.41 g cm^–3,V_c = 852.8(2) ų,MW = 362.9, (CuK) = 2.25 mm^–1. The structure was solved by direct methods and refined by full-matrix least squares to anR value of 0.055 for 1197 reflections. The cation consists of twotrans quinolizidine systems. RingA is a distorted half-chair, and the remaining rings are chairs. The CH₃ group attached to C(17) is in the axial position. There is a weak hydrogen bond between N(16) and O(2) of the ClO₄^– group with N(16) ... O(2) distance 2.968(7) Å.