Synonyms: 2,5-Ethano-2H-azocino[4,3-b]indole-6-carboxylic acid, 6-[(acetyloxy)me thyl]-4-ethylidene-1,3,4,5,6,7-hexahydro-, methyl ester, [5S-[4E,5alph a,6beta]]-;(4E,5S)-6-(Acetyloxymethyl)-4-ethylidene-1,3,4,5,6,7-hexahydro-2α,5α-ethano-2H-azocino[4,3-b]indole-6β-carboxylic acid methyl ester;O-Acetylvallesamine