Synonyms: 6,13a,16-Ethanylylidene-13aH-cyclonona[1,2-b:5,6-b']dinaphthalene-5,8,13,15,17(14H)-pentone,6,16-dihydro-1,4,7,9,18,19-hexahydroxy-2,11-dimethyl- (8CI); Purpurogenone(6CI); Purpurogenon; [6S-(6a,13aa,16a,18R*,19R*)]-6,16-Dihydro-1,4,7,9,18,19-hexahydroxy-2,11-dimethyl-6,13a,16-ethanylylidene-13aH-cyclonona[1,2-b:5,6-b']dinaphthalene-5,8,13,15,17(14H)-pentone