Synonyms: Riddelline(6CI); Senecionan-11,16-dione, 13,19-didehydro-12,18-dihydroxy-; Riddeline;Riddelliin; Riddelliine;[1,6]Dioxacyclododecino[2,3,4-gh]pyrrolizine-2,7-dione,3-ethylidene-3,4,5,6,9,11,13,14,14a,14b-decahydro-6-hydroxy-6-(hydroxymethyl)-5-methylene-,[6S-(3Z,6R*,14aS*,14bS*)]-