Synonyms: 4,8-Secosenecionan-8,11,16-trione,15,20-epoxy-15,20-dihydro-12-hydroxy-4-methyl-, (15a,20S)-; Othosenine (6CI); Otosenine (7CI,8CI);Otosenin; Otosenine (neutral);Spiro[2,9-dioxa-14-azabicyclo[9.5.1]heptadec-11-ene-4,2'-oxirane]-3,8,17-trione,7-hydroxy-3',6,7,14-tetramethyl-, [1R-[1R*,4S*(S*),6R*,7R*]]-; Tomentosine