(3aR,4R,5aR,9aS,9bS)-4-((2R,3S)-3-Methoxymethoxy-tetrahydro-furan-2-ylmethoxy)-8,8-dimethyl-2-oxo-hexahydro-1,5,7,9-tetraoxa-3-aza-cyclopenta[a]naphthalene-3-carboxylic acid tert-butyl ester

(3aR,4R,5aR,9aS,9bS)-4-((4aR,8R,8aS)-2,2-Dimethyl-4,4a,8,8a-tetrahydro-pyrano[3,2-d][1,3]dioxin-8-yloxy)-8,8-dimethyl-2-oxo-hexahydro-1,5,7,9-tetraoxa-3-aza-cyclopenta[a]naphthalene-3-carboxylic acid tert-butyl ester

(3aR,4R,5aR,9aS,9bS)-8,8-Dimethyl-4-((3aR,5R,5aS,8aS,8bR)-2,2,7,7-tetramethyl-tetrahydro-bis[1,3]dioxolo[4,5-b;4',5'-d]pyran-5-ylmethoxy)-hexahydro-1,5,7,9-tetraoxa-3-aza-cyclopenta[a]naphthalen-2-one

(3aR,4S,5aR,9aS,9bS)-8,8-Dimethyl-4-((3aR,5R,5aS,8aS,8bR)-2,2,7,7-tetramethyl-tetrahydro-bis[1,3]dioxolo[4,5-b;4',5'-d]pyran-5-ylmethoxy)-hexahydro-1,5,7,9-tetraoxa-3-aza-cyclopenta[a]naphthalen-2-one

(3aR,4R,5aR,9aS,9bS)-4-[(2R,3S)-2-(tert-Butyl-dimethyl-silanyloxymethyl)-tetrahydro-furan-3-yloxy]-8,8-dimethyl-2-oxo-hexahydro-1,5,7,9-tetraoxa-3-aza-cyclopenta[a]naphthalene-3-carboxylic acid tert-butyl ester