(7S)-Methyl-7,8-dihydro-2,5-diphenyl-5H-1,3-dioxolo<4,5-g><2>benzopyran-7-carboxylat

(S)-(-)-Methyl-3,4-dihydro-6,7-dihydroxy-1'-methylspiro<1H-2-benzopyran-1,4'-piperidin>-3-carboxylat

(1R,3S)-Methyl-3,4-dihydro-6,7-dihydroxy-1-phenyl-1H-2-benzopyran-3-carboxylat

(1S,3S)-Methyl-3,4-dihydro-6,7-dihydroxy-1-phenyl-1H-2-benzopyran-3-carboxylat