{[(2R,2aR,4aR,7aS,7bS)-2-Methoxy-6-(4-nitro-phenyl)-4-oxo-2a,4,4a,7b-tetrahydro-2H-1,3,7-trioxa-cyclopenta[cd]indene-7a-carbonyl]-amino}-acetic acid benzyl ester

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

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