(-)-Octosenine 16958-29-5 Othosenin Othosenine 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,2'S,3'S,6R,7R)- Tomentosine d-Otocenime d-Otosenine