1-chloroethyl (4R,4aS,7aR,12bS)-9-(benzyloxy)-4a-methoxy-7-oxo-1,2,4,4a,7,7a-hexahydro-3H-4,12-methanobenzofuro[3,2-e]isoquinoline-3-carboxylate

ent-4,5β-epoxy-3,9β-dimethoxy-17-methyl-hasuban-7-en-6-one