Synonyms: 6,21-Cyclo-4,5-secoakuammilan-17-oicacid, 4,5-dihydroxy-, methyl ester, (6a)-;1,5:3,6a-Dimethano-6aH-azocino[3,4-b]indole-6-carboxylic acid,4-ethylidene-1,2,3,4,5,6-hexahydro-2-hydroxy-12-(hydroxymethyl)-, methyl ester,[1S-(1a,3b,4E,5a,6b,6ab,12R*)]-; Dihydronareline; Nareline, dihydro-