Carbonic acid benzyl ester 2,6-dimethoxy-4-[(5R,5aR,8aR,9S)-6-oxo-9-(2-piperidin-1-yl-ethyl)-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 2,6-dimethoxy-4-((5R,5aR,8aR,9S)-9-{2-[(2-methoxy-ethyl)-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)-phenyl ester

Carbonic acid benzyl ester 4-((5R,5aR,8aR,9S)-9-{2-[(2-dimethylamino-ethyl)-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-[(2-hydroxy-1-hydroxymethyl-ethyl)-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 2,6-dimethoxy-4-{(5R,5aR,8aR,9S)-9-[2-(4-methyl-piperazin-1-yl)-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