The molecule is an organic heterotetracyclic compound that is 1,4,5,6,7,8-hexahydro-2H-3,6-ethanoazonino[5,4-b]indole in which position 5 is substituted by an ethylidene group and position 7S is substituted by a methoxycarbonyl group. It is a methyl ester, a monoterpenoid indole alkaloid, an organic heterotetracyclic compound and a bridged compound. It is a conjugate base of a (16S)-deshydroxymethyl-stemmadenine(1+).
methyl (1R,2S,16E)-16-ethylidene-4,14-diazatetracyclo[12.2.2.03,11.05,10]octadeca-3(11),5,7,9-tetraene-2-carboxylate