(+)-(1β,12α)-20-(tert-butyldiphenylsiloxy)-1,12-dihydroxypicras-3-ene-2,11,16-trione

(+)-(12α,16β)-20-(tert-butyldiphenylsiloxy)-16-methoxy-12-(methoxymethoxy)picrasane-1,11-dione

(2R,3R,3aS,5S,6aR,7aS,8R,11aS,11bS,11cS)-11c-(tert-Butyl-diphenyl-silanyloxymethyl)-5,11-dimethoxy-2-methoxymethoxy-3,8,11a-trimethyl-3,3a,4,5,6a,7,7a,8,9,11a,11b,11c-dodecahydro-2H-6-oxa-benzo[de]anthracen-1-one

(+)-(1β,12α,16β)-20-(tert-butyldiphenylsiloxy)-1,16-dimethoxy-12-(methoxymethoxy)picrasane-2,11-dione

(2R,3R,3aS,6aR,7aS,8S,11S,11aS,11bR,11cS)-9-Bromo-11c-(tert-butyl-diphenyl-silanyloxymethyl)-11-methoxy-2-methoxymethoxy-3,8,11a-trimethyl-dodecahydro-6-oxa-benzo[de]anthracene-1,5,10-trione