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    —— ethyl (1R,3S,3aS,6aS)-3,5-diethyl-1-(4-hydroxyphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C19H24N2O5
    ethyl (1R,3S,3aS,6aS)-3,5-diethyl-1-(4-hydroxyphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— ethyl (1R,3R,3aR,6aS)-3,5-diethyl-1-(4-fluorophenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C19H24FN2O4+
    ethyl (1R,3R,3aR,6aS)-3,5-diethyl-1-(4-fluorophenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— ethyl (1R,3R,3aR,6aS)-3,5-diethyl-1-(2-fluorophenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C19H23FN2O4
    ethyl (1R,3R,3aR,6aS)-3,5-diethyl-1-(2-fluorophenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— ethyl (1R,3S,3aR,6aS)-3,5-diethyl-4,6-dioxo-1-thiophen-2-yl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C17H23N2O4S+
    ethyl (1R,3S,3aR,6aS)-3,5-diethyl-4,6-dioxo-1-thiophen-2-yl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— ethyl (1R,3R,3aS,6aS)-1-(4-fluorophenyl)-5-methyl-3-(2-methylsulfanylethyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C19H24FN2O4S+
    ethyl (1R,3R,3aS,6aS)-1-(4-fluorophenyl)-5-methyl-3-(2-methylsulfanylethyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— ethyl (1R,3S,3aR,6aS)-3,5-diethyl-1-(furan-2-yl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C17H22N2O5
    ethyl (1R,3S,3aR,6aS)-3,5-diethyl-1-(furan-2-yl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— ethyl (1R,3R,3aS,6aS)-3,5-diethyl-4,6-dioxo-1-thiophen-2-yl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C17H22N2O4S
    ethyl (1R,3R,3aS,6aS)-3,5-diethyl-4,6-dioxo-1-thiophen-2-yl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— ethyl (1R,3R,3aS,6aS)-5-ethyl-1-(4-fluorophenyl)-3-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C18H22FN2O4+
    ethyl (1R,3R,3aS,6aS)-5-ethyl-1-(4-fluorophenyl)-3-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— ethyl (1R,3R,3aS,6aS)-3,5-diethyl-1-(4-methoxyphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C20H26N2O5
    ethyl (1R,3R,3aS,6aS)-3,5-diethyl-1-(4-methoxyphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— ethyl (1R,3R,3aS,6aS)-3,5-diethyl-1-(4-hydroxyphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C19H24N2O5
    ethyl (1R,3R,3aS,6aS)-3,5-diethyl-1-(4-hydroxyphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— ethyl (1R,3S,3aS,6aS)-5-methyl-4,6-dioxo-3-phenyl-1-thiophen-2-yl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C20H20N2O4S
    ethyl (1R,3S,3aS,6aS)-5-methyl-4,6-dioxo-3-phenyl-1-thiophen-2-yl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— ethyl (1R,3R,3aR,6aS)-1-(4-chlorophenyl)-3,5-diethyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C19H24ClN2O4+
    ethyl (1R,3R,3aR,6aS)-1-(4-chlorophenyl)-3,5-diethyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— ethyl (1R,3S,3aR,6aS)-1-(4-chlorophenyl)-3,5-diethyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C19H24ClN2O4+
    ethyl (1R,3S,3aR,6aS)-1-(4-chlorophenyl)-3,5-diethyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— ethyl (1R,3S,3aS,6aS)-3,5-diethyl-1-(3-fluorophenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C19H23FN2O4
    ethyl (1R,3S,3aS,6aS)-3,5-diethyl-1-(3-fluorophenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— ethyl (1R,3R,3aS,6aS)-1-(4-chlorophenyl)-5-methyl-3-(2-methylsulfanylethyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C19H24ClN2O4S+
    ethyl (1R,3R,3aS,6aS)-1-(4-chlorophenyl)-5-methyl-3-(2-methylsulfanylethyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— ethyl (1S,3R,3aS,6aS)-5-ethyl-1-(4-methoxyphenyl)-3-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C19H25N2O5+
    ethyl (1S,3R,3aS,6aS)-5-ethyl-1-(4-methoxyphenyl)-3-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— ethyl (1R,3S,3aS,6aS)-3,5-diethyl-4,6-dioxo-1-thiophen-2-yl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C17H22N2O4S
    ethyl (1R,3S,3aS,6aS)-3,5-diethyl-4,6-dioxo-1-thiophen-2-yl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— ethyl (1R,3R,3aR,6aS)-3,5-diethyl-1-(2-fluorophenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C19H24FN2O4+
    ethyl (1R,3R,3aR,6aS)-3,5-diethyl-1-(2-fluorophenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— ethyl 2,4-dimethyl-5-[(2S)-2-[2-(2-oxo-1,3-benzoxazol-3-yl)acetyl]oxypropanoyl]-1H-pyrrole-3-carboxylate —— C21H22N2O7
    ethyl 2,4-dimethyl-5-[(2S)-2-[2-(2-oxo-1,3-benzoxazol-3-yl)acetyl]oxypropanoyl]-1H-pyrrole-3-carboxylate
    —— ethyl (1R,3S,3aR,6aS)-3,5-diethyl-1-(4-methoxyphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C20H26N2O5
    ethyl (1R,3S,3aR,6aS)-3,5-diethyl-1-(4-methoxyphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— ethyl 2,4-dimethyl-5-[(2R)-2-[2-(2-oxo-1,3-benzoxazol-3-yl)acetyl]oxypropanoyl]-1H-pyrrole-3-carboxylate —— C21H22N2O7
    ethyl 2,4-dimethyl-5-[(2R)-2-[2-(2-oxo-1,3-benzoxazol-3-yl)acetyl]oxypropanoyl]-1H-pyrrole-3-carboxylate
    —— ethyl (1S,3R,3aS,6aS)-5-ethyl-3-methyl-1-(4-methylphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C19H24N2O4
    ethyl (1S,3R,3aS,6aS)-5-ethyl-3-methyl-1-(4-methylphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— ethyl (1R,3S,3aR,6aS)-3,5-diethyl-4,6-dioxo-1-thiophen-2-yl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C17H22N2O4S
    ethyl (1R,3S,3aR,6aS)-3,5-diethyl-4,6-dioxo-1-thiophen-2-yl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— ethyl (1R,3S,3aS,6aS)-1-(3-fluorophenyl)-5-methyl-3-(2-methylsulfanylethyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C19H23FN2O4S
    ethyl (1R,3S,3aS,6aS)-1-(3-fluorophenyl)-5-methyl-3-(2-methylsulfanylethyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— ethyl (1R,3S,3aR,6aS)-3-(hydroxymethyl)-1-(4-hydroxyphenyl)-5-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C17H20N2O6
    ethyl (1R,3S,3aR,6aS)-3-(hydroxymethyl)-1-(4-hydroxyphenyl)-5-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— ethyl (1R,3S,3aS,6aS)-1-(4-chlorophenyl)-5-methyl-3-(2-methylsulfanylethyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C19H23ClN2O4S
    ethyl (1R,3S,3aS,6aS)-1-(4-chlorophenyl)-5-methyl-3-(2-methylsulfanylethyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— ethyl (1R,3S,3aR,6aS)-1-(2-fluorophenyl)-5-methyl-3-(2-methylsulfanylethyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C19H23FN2O4S
    ethyl (1R,3S,3aR,6aS)-1-(2-fluorophenyl)-5-methyl-3-(2-methylsulfanylethyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— ethyl (1R,3R,3aR,6aS)-1-(3-fluorophenyl)-5-methyl-3-(2-methylsulfanylethyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C19H23FN2O4S
    ethyl (1R,3R,3aR,6aS)-1-(3-fluorophenyl)-5-methyl-3-(2-methylsulfanylethyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— ethyl (1R,3S,3aR,6aS)-1-(2-fluorophenyl)-5-methyl-3-(2-methylsulfanylethyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C19H24FN2O4S+
    ethyl (1R,3S,3aR,6aS)-1-(2-fluorophenyl)-5-methyl-3-(2-methylsulfanylethyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— ethyl (1R,3R,3aS,6aS)-1-(2-fluorophenyl)-5-methyl-3-(2-methylsulfanylethyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C19H24FN2O4S+
    ethyl (1R,3R,3aS,6aS)-1-(2-fluorophenyl)-5-methyl-3-(2-methylsulfanylethyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— ethyl (4R)-6-[[(3S,5S)-3,5-dimethylpiperidin-1-yl]methyl]-4-methyl-2-oxo-3,4-dihydro-1H-pyrimidine-5-carboxylate —— C16H27N3O3
    ethyl (4R)-6-[[(3S,5S)-3,5-dimethylpiperidin-1-yl]methyl]-4-methyl-2-oxo-3,4-dihydro-1H-pyrimidine-5-carboxylate
    —— ethyl (1R,3R,3aR,6aS)-3-[(4-hydroxyphenyl)methyl]-5-methyl-1-(2-methylphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C24H27N2O5+
    ethyl (1R,3R,3aR,6aS)-3-[(4-hydroxyphenyl)methyl]-5-methyl-1-(2-methylphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— ethyl (4S)-4-methyl-6-[(4-methylpiperidin-1-yl)methyl]-2-oxo-3,4-dihydro-1H-pyrimidine-5-carboxylate —— C15H25N3O3
    ethyl (4S)-4-methyl-6-[(4-methylpiperidin-1-yl)methyl]-2-oxo-3,4-dihydro-1H-pyrimidine-5-carboxylate
    —— ethyl (1R,3R,3aR,6aS)-1-(2-fluorophenyl)-5-methyl-4,6-dioxo-3-phenyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C22H22FN2O4+
    ethyl (1R,3R,3aR,6aS)-1-(2-fluorophenyl)-5-methyl-4,6-dioxo-3-phenyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— ethyl (1R,3S,3aS,6aS)-5-methyl-4,6-dioxo-3-phenyl-1-thiophen-2-yl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C20H21N2O4S+
    ethyl (1R,3S,3aS,6aS)-5-methyl-4,6-dioxo-3-phenyl-1-thiophen-2-yl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— ethyl (1R,3R,3aS,6aS)-5-methyl-1-(3-methylphenyl)-3-(2-methylsulfanylethyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C20H26N2O4S
    ethyl (1R,3R,3aS,6aS)-5-methyl-1-(3-methylphenyl)-3-(2-methylsulfanylethyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— ethyl (1R,3S,3aR,6aS)-1-(4-hydroxyphenyl)-5-methyl-3-(2-methylsulfanylethyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C19H24N2O5S
    ethyl (1R,3S,3aR,6aS)-1-(4-hydroxyphenyl)-5-methyl-3-(2-methylsulfanylethyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— ethyl (1R,3R,3aS,6aS)-3-(hydroxymethyl)-1-(4-hydroxyphenyl)-5-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C17H20N2O6
    ethyl (1R,3R,3aS,6aS)-3-(hydroxymethyl)-1-(4-hydroxyphenyl)-5-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— ethyl (1S,3R,3aS,6aS)-5-ethyl-3-methyl-1-(2-methylphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C19H25N2O4+
    ethyl (1S,3R,3aS,6aS)-5-ethyl-3-methyl-1-(2-methylphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— ethyl (1R,3S,3aS,6aS)-1-(2-fluorophenyl)-5-methyl-3-(2-methylsulfanylethyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C19H24FN2O4S+
    ethyl (1R,3S,3aS,6aS)-1-(2-fluorophenyl)-5-methyl-3-(2-methylsulfanylethyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— ethyl (1R,3R,3aS,6aS)-5-ethyl-1-(furan-2-yl)-3-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C16H20N2O5
    ethyl (1R,3R,3aS,6aS)-5-ethyl-1-(furan-2-yl)-3-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— ethyl (1R,3S,3aR,6aS)-5-methyl-3-(2-methylsulfanylethyl)-4,6-dioxo-1-thiophen-2-yl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C17H22N2O4S2
    ethyl (1R,3S,3aR,6aS)-5-methyl-3-(2-methylsulfanylethyl)-4,6-dioxo-1-thiophen-2-yl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— ethyl (1R,3S,3aS,6aS)-3-(hydroxymethyl)-5-methyl-1-(2-methylphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C18H22N2O5
    ethyl (1R,3S,3aS,6aS)-3-(hydroxymethyl)-5-methyl-1-(2-methylphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— ethyl (1R,3S,3aS,6aS)-3-(hydroxymethyl)-1-(4-hydroxyphenyl)-5-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C17H20N2O6
    ethyl (1R,3S,3aS,6aS)-3-(hydroxymethyl)-1-(4-hydroxyphenyl)-5-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— ethyl (1R,3S,3aR,6aS)-1-(4-fluorophenyl)-5-methyl-3-(2-methylsulfanylethyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C19H23FN2O4S
    ethyl (1R,3S,3aR,6aS)-1-(4-fluorophenyl)-5-methyl-3-(2-methylsulfanylethyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— ethyl (1R,3R,3aS,6aS)-3-[(4-hydroxyphenyl)methyl]-5-methyl-1-(2-methylphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C24H26N2O5
    ethyl (1R,3R,3aS,6aS)-3-[(4-hydroxyphenyl)methyl]-5-methyl-1-(2-methylphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— ethyl (1R,3R,3aR,6aS)-1-(2-fluorophenyl)-5-methyl-3-(2-methylsulfanylethyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C19H23FN2O4S
    ethyl (1R,3R,3aR,6aS)-1-(2-fluorophenyl)-5-methyl-3-(2-methylsulfanylethyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— ethyl (1R,3R,3aS,6aS)-3-benzyl-5-ethyl-1-(furan-2-yl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C22H24N2O5
    ethyl (1R,3R,3aS,6aS)-3-benzyl-5-ethyl-1-(furan-2-yl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— ethyl (4R)-4-methyl-2-oxo-6-[[2-(2-oxo-1,3-benzoxazol-3-yl)acetyl]oxymethyl]-3,4-dihydro-1H-pyrimidine-5-carboxylate —— C18H19N3O7
    ethyl (4R)-4-methyl-2-oxo-6-[[2-(2-oxo-1,3-benzoxazol-3-yl)acetyl]oxymethyl]-3,4-dihydro-1H-pyrimidine-5-carboxylate
    —— ethyl (1R,3R,3aS,6aS)-1-(4-hydroxyphenyl)-5-methyl-3-(2-methylsulfanylethyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C19H24N2O5S
    ethyl (1R,3R,3aS,6aS)-1-(4-hydroxyphenyl)-5-methyl-3-(2-methylsulfanylethyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate