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    —— methyl (1S,3S,3aR,6aR)-5-methyl-1-(2-methylphenyl)-3-(2-methylsulfanylethyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C19H25N2O4S+
    methyl (1S,3S,3aR,6aR)-5-methyl-1-(2-methylphenyl)-3-(2-methylsulfanylethyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— methyl (1R,3S,3aR,6aS)-5-methyl-1-(4-methylphenyl)-3-(2-methylsulfanylethyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C19H25N2O4S+
    methyl (1R,3S,3aR,6aS)-5-methyl-1-(4-methylphenyl)-3-(2-methylsulfanylethyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— methyl (1S,3S,3aS,6aS)-1-(2-fluorophenyl)-3-(hydroxymethyl)-5-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C16H17FN2O5
    methyl (1S,3S,3aS,6aS)-1-(2-fluorophenyl)-3-(hydroxymethyl)-5-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— methyl (1S,3R,3aR,6aR)-3-(hydroxymethyl)-5-methyl-1-(4-methylphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C17H20N2O5
    methyl (1S,3R,3aR,6aR)-3-(hydroxymethyl)-5-methyl-1-(4-methylphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— methyl (1S,3R,3aR,6aR)-5-methyl-1-(2-methylphenyl)-4,6-dioxo-3-phenyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C22H23N2O4+
    methyl (1S,3R,3aR,6aR)-5-methyl-1-(2-methylphenyl)-4,6-dioxo-3-phenyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— methyl (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 —— C18H22FN2O4S+
    methyl (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
    —— methyl (1S,3R,3aS,6aS)-1-(4-methoxyphenyl)-5-methyl-3-(2-methylsulfanylethyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C19H25N2O5S+
    methyl (1S,3R,3aS,6aS)-1-(4-methoxyphenyl)-5-methyl-3-(2-methylsulfanylethyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— methyl (1S,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 —— C19H18N2O4S
    methyl (1S,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
    —— methyl (1R,3S,3aS,6aS)-1-(2-methoxyphenyl)-5-methyl-4,6-dioxo-3-propan-2-yl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C19H25N2O5+
    methyl (1R,3S,3aS,6aS)-1-(2-methoxyphenyl)-5-methyl-4,6-dioxo-3-propan-2-yl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— methyl (1S,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 —— C18H22FN2O4S+
    methyl (1S,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
    —— methyl (2R)-2-[(2-ethoxyphenyl)methylamino]-3-methylbutanoate —— C15H23NO3
    methyl (2R)-2-[(2-ethoxyphenyl)methylamino]-3-methylbutanoate
    —— methyl (2R)-3-methyl-2-[(4-propan-2-ylphenyl)methylamino]butanoate —— C16H25NO2
    methyl (2R)-3-methyl-2-[(4-propan-2-ylphenyl)methylamino]butanoate
    —— methyl (2R)-2-[[(1R)-1-(4-chlorophenyl)ethyl]amino]-3-methylbutanoate —— C14H20ClNO2
    methyl (2R)-2-[[(1R)-1-(4-chlorophenyl)ethyl]amino]-3-methylbutanoate
    —— methyl (1S,3S,3aS,6aS)-1-(4-hydroxyphenyl)-5-methyl-4,6-dioxo-3-phenyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C21H21N2O5+
    methyl (1S,3S,3aS,6aS)-1-(4-hydroxyphenyl)-5-methyl-4,6-dioxo-3-phenyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— methyl (1R,3S,3aR,6aS)-1-(4-chlorophenyl)-5-methyl-4,6-dioxo-3-propyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C18H22ClN2O4+
    methyl (1R,3S,3aR,6aS)-1-(4-chlorophenyl)-5-methyl-4,6-dioxo-3-propyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— methyl (1R,3S,3aS,6aS)-1-(4-chlorophenyl)-5-methyl-4,6-dioxo-3-propyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C18H22ClN2O4+
    methyl (1R,3S,3aS,6aS)-1-(4-chlorophenyl)-5-methyl-4,6-dioxo-3-propyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— methyl (1S,3R,3aS,6aS)-1-(4-fluorophenyl)-3-[(4-hydroxyphenyl)methyl]-5-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C22H22FN2O5+
    methyl (1S,3R,3aS,6aS)-1-(4-fluorophenyl)-3-[(4-hydroxyphenyl)methyl]-5-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— methyl (1R,3R,3aS,6aS)-5-methyl-1-(2-methylphenyl)-4,6-dioxo-3-propyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C19H24N2O4
    methyl (1R,3R,3aS,6aS)-5-methyl-1-(2-methylphenyl)-4,6-dioxo-3-propyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— methyl (1S,3S,3aR,6aS)-5-methyl-1-(4-methylphenyl)-3-(2-methylsulfanylethyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C19H25N2O4S+
    methyl (1S,3S,3aR,6aS)-5-methyl-1-(4-methylphenyl)-3-(2-methylsulfanylethyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— methyl (1R,3R,3aS,6aS)-1-(4-fluorophenyl)-3-[(4-hydroxyphenyl)methyl]-5-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C22H21FN2O5
    methyl (1R,3R,3aS,6aS)-1-(4-fluorophenyl)-3-[(4-hydroxyphenyl)methyl]-5-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— methyl (1S,3S,3aS,6aS)-1-(4-chlorophenyl)-3-(hydroxymethyl)-5-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C16H17ClN2O5
    methyl (1S,3S,3aS,6aS)-1-(4-chlorophenyl)-3-(hydroxymethyl)-5-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— methyl (1S,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 —— C19H19N2O4S+
    methyl (1S,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
    —— methyl (1R,3R,3aS,6aS)-1-(4-chlorophenyl)-5-methyl-4,6-dioxo-3-propyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C18H21ClN2O4
    methyl (1R,3R,3aS,6aS)-1-(4-chlorophenyl)-5-methyl-4,6-dioxo-3-propyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— methyl (1R,3R,3aR,6aS)-5-methyl-1-(2-methylphenyl)-4,6-dioxo-3-propyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C19H25N2O4+
    methyl (1R,3R,3aR,6aS)-5-methyl-1-(2-methylphenyl)-4,6-dioxo-3-propyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— methyl (1R,3S,3aR,6aS)-1-(furan-2-yl)-5-methyl-4,6-dioxo-3-propyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C16H21N2O5+
    methyl (1R,3S,3aR,6aS)-1-(furan-2-yl)-5-methyl-4,6-dioxo-3-propyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— methyl (1R,3S,3aS,6aS)-1-(2-methoxyphenyl)-5-methyl-4,6-dioxo-3-propan-2-yl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C19H24N2O5
    methyl (1R,3S,3aS,6aS)-1-(2-methoxyphenyl)-5-methyl-4,6-dioxo-3-propan-2-yl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— methyl (1R,3S,3aS,6aS)-1-(4-chlorophenyl)-5-methyl-4,6-dioxo-3-propyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C18H21ClN2O4
    methyl (1R,3S,3aS,6aS)-1-(4-chlorophenyl)-5-methyl-4,6-dioxo-3-propyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— methyl (1R,3S,3aS,6aS)-1-(4-fluorophenyl)-5-methyl-4,6-dioxo-3-propyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C18H22FN2O4+
    methyl (1R,3S,3aS,6aS)-1-(4-fluorophenyl)-5-methyl-4,6-dioxo-3-propyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— methyl (1R,3R,3aR,6aR)-3-(hydroxymethyl)-5-methyl-1-(2-methylphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C17H20N2O5
    methyl (1R,3R,3aR,6aR)-3-(hydroxymethyl)-5-methyl-1-(2-methylphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— methyl (1R,3R,3aS,6aS)-1-(furan-2-yl)-5-methyl-3-(2-methylsulfanylethyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C16H21N2O5S+
    methyl (1R,3R,3aS,6aS)-1-(furan-2-yl)-5-methyl-3-(2-methylsulfanylethyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— methyl (1R,3S,3aR,6aS)-1-(4-hydroxyphenyl)-5-methyl-4,6-dioxo-3-propyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C18H23N2O5+
    methyl (1R,3S,3aR,6aS)-1-(4-hydroxyphenyl)-5-methyl-4,6-dioxo-3-propyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— methyl (1R,3S,3aS,6aS)-3-ethyl-1-(4-methoxyphenyl)-5-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C18H23N2O5+
    methyl (1R,3S,3aS,6aS)-3-ethyl-1-(4-methoxyphenyl)-5-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— methyl (1R,3R,3aS,6aS)-5-methyl-3-(2-methylsulfanylethyl)-4,6-dioxo-1-thiophen-2-yl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C16H20N2O4S2
    methyl (1R,3R,3aS,6aS)-5-methyl-3-(2-methylsulfanylethyl)-4,6-dioxo-1-thiophen-2-yl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— methyl (2R)-2-[(5-chlorothiophen-2-yl)methylamino]-3-methylbutanoate —— C11H16ClNO2S
    methyl (2R)-2-[(5-chlorothiophen-2-yl)methylamino]-3-methylbutanoate
    —— methyl (1R,3R,3aR,6aS)-3-(hydroxymethyl)-5-methyl-1-(2-methylphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C17H20N2O5
    methyl (1R,3R,3aR,6aS)-3-(hydroxymethyl)-5-methyl-1-(2-methylphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— methyl (1S,3S,3aS,6aS)-1-(4-fluorophenyl)-5-methyl-4,6-dioxo-3-phenyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C21H19FN2O4
    methyl (1S,3S,3aS,6aS)-1-(4-fluorophenyl)-5-methyl-4,6-dioxo-3-phenyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— methyl (1R,3R,3aR,6aS)-1-(4-hydroxyphenyl)-5-methyl-4,6-dioxo-3-propyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C18H22N2O5
    methyl (1R,3R,3aR,6aS)-1-(4-hydroxyphenyl)-5-methyl-4,6-dioxo-3-propyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— methyl (1R,3S,3aR,6aS)-1-(2-methoxyphenyl)-5-methyl-4,6-dioxo-3-propyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C19H24N2O5
    methyl (1R,3S,3aR,6aS)-1-(2-methoxyphenyl)-5-methyl-4,6-dioxo-3-propyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— methyl (1S,3R,3aR,6aR)-3-(hydroxymethyl)-5-methyl-1-(4-methylphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C17H21N2O5+
    methyl (1S,3R,3aR,6aR)-3-(hydroxymethyl)-5-methyl-1-(4-methylphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— methyl (1R,3S,3aS,6aS)-1-(4-hydroxyphenyl)-5-methyl-4,6-dioxo-3-phenyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C21H21N2O5+
    methyl (1R,3S,3aS,6aS)-1-(4-hydroxyphenyl)-5-methyl-4,6-dioxo-3-phenyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— methyl (1R,3S,3aR,6aS)-1-(furan-2-yl)-5-methyl-4,6-dioxo-3-propyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C16H20N2O5
    methyl (1R,3S,3aR,6aS)-1-(furan-2-yl)-5-methyl-4,6-dioxo-3-propyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— methyl (1R,3S,3aS,6aS)-3-ethyl-1-(2-methoxyphenyl)-5-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C18H22N2O5
    methyl (1R,3S,3aS,6aS)-3-ethyl-1-(2-methoxyphenyl)-5-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— methyl (1R,3R,3aR,6aS)-1-(2-methoxyphenyl)-5-methyl-4,6-dioxo-3-propyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C19H25N2O5+
    methyl (1R,3R,3aR,6aS)-1-(2-methoxyphenyl)-5-methyl-4,6-dioxo-3-propyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— Methyl 2-[(1-benzylpyrrol-2-yl)methyl-(cyclohexylmethyl)amino]acetate —— C22H30N2O2
    Methyl 2-[(1-benzylpyrrol-2-yl)methyl-(cyclohexylmethyl)amino]acetate
    —— methyl (1R,3R,3aR,6aS)-1-(furan-2-yl)-5-methyl-4,6-dioxo-3-propyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C16H21N2O5+
    methyl (1R,3R,3aR,6aS)-1-(furan-2-yl)-5-methyl-4,6-dioxo-3-propyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— methyl (1R,3R,3aR,6aS)-1-(4-methoxyphenyl)-3,5-dimethyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C17H20N2O5
    methyl (1R,3R,3aR,6aS)-1-(4-methoxyphenyl)-3,5-dimethyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— Methyl 4-methyl-3-[[2-[2-(2-oxo-1,3-benzoxazol-3-yl)acetyl]oxyacetyl]amino]benzoate —— C20H18N2O7
    Methyl 4-methyl-3-[[2-[2-(2-oxo-1,3-benzoxazol-3-yl)acetyl]oxyacetyl]amino]benzoate
    —— methyl (1R,3S,3aS,6aS)-1-(4-chlorophenyl)-3,5-dimethyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C16H17ClN2O4
    methyl (1R,3S,3aS,6aS)-1-(4-chlorophenyl)-3,5-dimethyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— methyl (1R,3S,3aS,6aS)-1-(4-hydroxyphenyl)-5-methyl-4,6-dioxo-3-propyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C18H23N2O5+
    methyl (1R,3S,3aS,6aS)-1-(4-hydroxyphenyl)-5-methyl-4,6-dioxo-3-propyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— methyl (1R,3R,3aR,6aS)-1-(furan-2-yl)-5-methyl-4,6-dioxo-3-propyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C16H20N2O5
    methyl (1R,3R,3aR,6aS)-1-(furan-2-yl)-5-methyl-4,6-dioxo-3-propyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate