methyl (1S,4R,5bR,8S,10aS,11S,11aS,13S)-8,13-dihydroxy-1-methyl-9-methylene-2-oxo-1,2,5b,6,7,8,9,10,11,11a-decahydro-4H-1,4:8,10a-dimethanoazuleno[1,2-d]oxepine-11-carboxylate

1α,10β-Dimethoxycarbonyl-2β-tosyloxy-7-hydroxy-1β,8-epi-dimethyl-gibban-(4aβ)

1α,10β-Dimethoxycarbonyl-2β-hydroxy-7-tosyloxy-1β,8-epi-dimethyl-gibban-(4aβ)

1α,10β-Dimethoxycarbonyl-2β,7-ditosyloxy-1β,8-epi-dimethyl-gibban-(4aβ)