(8a'R)-3'-methoxy-11'-methyl-8',8a',9',10'-tetrahydro-5'H,7'H-spiro[[1,3]dithiolane-2,6'-[9,4b](epiminoethano)phenanthren]-4'-ol

(8a'R)-3',4'-dimethoxy-11'-methyl-8',8a',9',10'-tetrahydro-5'H,7'H-spiro[[1,3]dithiolane-2,6'-[9,4b](epiminoethano)phenanthrene]

4,5α-epoxy-3-methoxy-17-methyl-morphin-15-en-6-one