IUPAC: (3aS,3bS,11aS)-11a-methyl-1,2,3,3a,3b,4,5,6,8,9,11,11a-dodecahydrospiro[cyclopenta[a]phenanthrene-7,2'-[1,3]dioxolan]-1-one

SMILES: C[C@]12CC=C3[C@@H](CCC4=C3CCC3(C4)OCCO3)[C@@H]1CCC2=O |c:3,8|