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