Trichotomine Dimethyl Ester

The title compound, methyl 2-[6,11-dihydro-5-(methoxycarbonyl)-3-oxo-3H-indolizino[8,7-b]indol-2(5H)ylidene]-2,5,6,11-tetrahydro-3-oxo-3H-indolizino[8,7-b]indole-5-carboxylate, C₃₂H₂₄N₄O₆, crystallized from tert-butanol as the disolvate. The compound has approximate C₂ symmetry. The two central five-membered rings are linked by a C=C double bond and are approximately coplanar. The two lateral indole rings are canted slightly out of this plane by 5 and 8°. The molecular skeleton is thus essentially planar, except for the methoxycarbonyl groups, which are nearly perpendicular to the rest of the molecule.

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