Carbonic acid benzyl ester 2,6-dimethoxy-4-{(5R,5aR,8aR,9S)-9-[2-(methyl-pyridin-2-ylmethyl-amino)-ethyl]-6-oxo-5,5a,6,8,8a,9-hexahydro-furo[3',4':6,7]naphtho[2,3-d][1,3]dioxol-5-yl}-phenyl ester

Carbonic acid benzyl ester 4-((5R,5aR,8aR,9S)-9-{2-[(3-dimethylamino-propyl)-methyl-amino]-ethyl}-6-oxo-5,5a,6,8,8a,9-hexahydro-furo[3',4':6,7]naphtho[2,3-d][1,3]dioxol-5-yl)-2,6-dimethoxy-phenyl ester

Carbonic acid benzyl ester 4-[(5R,5aR,8aR,9S)-9-(2-dimethylamino-ethyl)-6-oxo-5,5a,6,8,8a,9-hexahydro-furo[3',4':6,7]naphtho[2,3-d][1,3]dioxol-5-yl]-2,6-dimethoxy-phenyl ester

Carbonic acid benzyl ester 4-[(5R,5aR,8aR,9S)-9-(3-dimethylamino-propyl)-6-oxo-5,5a,6,8,8a,9-hexahydro-furo[3',4':6,7]naphtho[2,3-d][1,3]dioxol-5-yl]-2,6-dimethoxy-phenyl ester

Carbonic acid benzyl ester 2,6-dimethoxy-4-{(5R,5aR,8aR,9S)-6-oxo-9-[2-(N,N',N'-trimethyl-hydrazino)-ethyl]-5,5a,6,8,8a,9-hexahydro-furo[3',4':6,7]naphtho[2,3-d][1,3]dioxol-5-yl}-phenyl ester