methyl (2R,2aR,4aR,7aS,7bS)-6-(4-nitrophenyl)-2-methoxy-4-oxo-2a,4,4a,7b-tetrahydro-2H-1,3,7-trioxacyclopenta[cd]indene-7a-carboxylate

methyl (4R,5R)-5-methoxy-4-[(E)-4-(3-nitrophenyl)-4-oxobut-2-enoyloxy]-4,5-dihydrofuran-2-carboxylate

(2R,2aR,4aR,6R,7aS,7bS)-6-(3-Amino-phenyl)-2-methoxy-4-oxo-hexahydro-1,3,7-trioxa-cyclopenta[cd]indene-7a-carboxylic acid methyl ester

methyl (4R,5R)-4-((E)-3-acetyloct-2-enoyloxy)-5-methoxy-4,5-dihydrofuran-2-carboxylate

(2R,2aR,4aR,6R,7aS,7bS)-6-(4-Amino-phenyl)-2-methoxy-4-oxo-hexahydro-1,3,7-trioxa-cyclopenta[cd]indene-7a-carboxylic acid methyl ester