stemospironine

(2S,3'S,4R,8'R,9'aS)-Decahydro-8'-methoxy-4-methyl-3'-[(2S,4S)-tetrahydro-4-methyl-5-oxo-2-furanyl]-spiro[furan-2(5H),9'-[9H]pyrrolo[1,2-a]azepin]-5-one

(2S,3'S,4R,9'aβ)-3,4,1',2',3',5',6',7',8',9'a-Decahydro-8'β-methoxy-4-methyl-3'β-[(2S,4S)-tetrahydro-4-methyl-5-oxofuran-2-yl]spiro[furan-2(5H),9'-[9H]pyrrolo[1,2-a]azepin]-5-one