51212-98-7 [8-(acetyloxy)-3-methylidene-2,6-dioxo-2,3,3a,4,8,9,10,12a-octahydro-4,7-(metheno)furo[3,2-c]oxacycloundecin-11(6H)-yl]methyl acetate 71812-08-3 (2S,5S,11R,11aR,14aR,14bS)-16-methyldodecahydro-4H-5,2-(epiminomethano)-11,7-(metheno)azacycloundecino[3,2,1-hi]indole-10,12-dione