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    —— methyl (1R,3R,3aS,6aS)-1-(4-chlorophenyl)-3,5-diethyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C18H21ClN2O4
    methyl (1R,3R,3aS,6aS)-1-(4-chlorophenyl)-3,5-diethyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— methyl (1R,3S,3aS,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,3aS,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,3R,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,3R,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 (1R,3S,3aR,6aS)-3-ethyl-1-(4-methoxyphenyl)-5-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C18H22N2O5
    methyl (1R,3S,3aR,6aS)-3-ethyl-1-(4-methoxyphenyl)-5-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— methyl (1R,3S,3aS,6aS)-3-ethyl-1-(4-hydroxyphenyl)-5-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C17H20N2O5
    methyl (1R,3S,3aS,6aS)-3-ethyl-1-(4-hydroxyphenyl)-5-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— methyl (1R,3R,3aS,6aS)-3-ethyl-1-(4-hydroxyphenyl)-5-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C17H20N2O5
    methyl (1R,3R,3aS,6aS)-3-ethyl-1-(4-hydroxyphenyl)-5-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— methyl (1R,3S,3aS,6aS)-1-(4-chlorophenyl)-3-ethyl-5-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C17H20ClN2O4+
    methyl (1R,3S,3aS,6aS)-1-(4-chlorophenyl)-3-ethyl-5-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— methyl (1R,3R,3aR,6aS)-1-(4-chlorophenyl)-3-ethyl-5-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C17H20ClN2O4+
    methyl (1R,3R,3aR,6aS)-1-(4-chlorophenyl)-3-ethyl-5-methyl-4,6-dioxo-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]pyrrole-3-carboxylate —— C18H22N2O5
    methyl (1R,3S,3aS,6aS)-3-ethyl-1-(4-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-propan-2-yl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C19H24N2O5
    methyl (1R,3R,3aR,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,3R,3aR,6aS)-1-(4-fluorophenyl)-5-methyl-4,6-dioxo-3-propyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C18H21FN2O4
    methyl (1R,3R,3aR,6aS)-1-(4-fluorophenyl)-5-methyl-4,6-dioxo-3-propyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— methyl (1R,3R,3aR,6aS)-1-(4-chlorophenyl)-3,5-diethyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C18H21ClN2O4
    methyl (1R,3R,3aR,6aS)-1-(4-chlorophenyl)-3,5-diethyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— methyl (1R,3R,3aS,6aS)-1-(2-methoxyphenyl)-5-methyl-3-(2-methylsulfanylethyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C19H25N2O5S+
    methyl (1R,3R,3aS,6aS)-1-(2-methoxyphenyl)-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-fluorophenyl)-3-[(4-hydroxyphenyl)methyl]-5-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C22H21FN2O5
    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]pyrrole-3-carboxylate
    —— methyl (1R,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 (1R,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,3R,3aS,6aS)-1-(4-fluorophenyl)-5-methyl-4,6-dioxo-3-propyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C18H21FN2O4
    methyl (1R,3R,3aS,6aS)-1-(4-fluorophenyl)-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-chlorophenyl)-3,5-dimethyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C16H18ClN2O4+
    methyl (1R,3S,3aS,6aS)-1-(4-chlorophenyl)-3,5-dimethyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— methyl (1R,3S,3aR,6aS)-1-(4-fluorophenyl)-3,5-dimethyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C16H17FN2O4
    methyl (1R,3S,3aR,6aS)-1-(4-fluorophenyl)-3,5-dimethyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— methyl (1R,3R,3aS,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,3aS,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 (1S,3R,3aS,6aS)-1-(4-hydroxyphenyl)-5-methyl-3-(2-methylsulfanylethyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C18H23N2O5S+
    methyl (1S,3R,3aS,6aS)-1-(4-hydroxyphenyl)-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-fluorophenyl)-5-methyl-4,6-dioxo-3-propyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C18H21FN2O4
    methyl (1R,3S,3aR,6aS)-1-(4-fluorophenyl)-5-methyl-4,6-dioxo-3-propyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— methyl (1R,3R,3aR,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,3aR,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,3aR,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,3aR,6aS)-1-(4-chlorophenyl)-5-methyl-4,6-dioxo-3-propyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— methyl (1S,3R,3aS,6aS)-3-benzyl-5-methyl-4,6-dioxo-1-thiophen-2-yl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C20H20N2O4S
    methyl (1S,3R,3aS,6aS)-3-benzyl-5-methyl-4,6-dioxo-1-thiophen-2-yl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— methyl (1R,3S,3aR,6aS)-3,5-dimethyl-4,6-dioxo-1-thiophen-2-yl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C14H16N2O4S
    methyl (1R,3S,3aR,6aS)-3,5-dimethyl-4,6-dioxo-1-thiophen-2-yl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— methyl (1R,3S,3aR,6aS)-3-ethyl-1-(4-fluorophenyl)-5-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C17H20FN2O4+
    methyl (1R,3S,3aR,6aS)-3-ethyl-1-(4-fluorophenyl)-5-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— methyl (1R,3S,3aR,6aR)-3,5-dimethyl-1-(4-methylphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C17H20N2O4
    methyl (1R,3S,3aR,6aR)-3,5-dimethyl-1-(4-methylphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— methyl (1R,3S,3aS,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,3S,3aS,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,3R,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,3R,3aS,6aS)-1-(4-chlorophenyl)-3,5-dimethyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— methyl (1S,3R,3aS,6aS)-3-benzyl-1-(4-hydroxyphenyl)-5-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C22H23N2O5+
    methyl (1S,3R,3aS,6aS)-3-benzyl-1-(4-hydroxyphenyl)-5-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— methyl (1R,3S,3aS,6aS)-1-(2-methoxyphenyl)-3,5-dimethyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C17H20N2O5
    methyl (1R,3S,3aS,6aS)-1-(2-methoxyphenyl)-3,5-dimethyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— methyl (1R,3S,3aS,6aS)-1-(3-fluorophenyl)-3,5-dimethyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C16H17FN2O4
    methyl (1R,3S,3aS,6aS)-1-(3-fluorophenyl)-3,5-dimethyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— methyl (1R,3R,3aR,6aR)-5-methyl-1-(2-methylphenyl)-4,6-dioxo-3-phenyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C22H22N2O4
    methyl (1R,3R,3aR,6aR)-5-methyl-1-(2-methylphenyl)-4,6-dioxo-3-phenyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— methyl (1R,3S,3aS,6aS)-1-(4-fluorophenyl)-3,5-dimethyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C16H18FN2O4+
    methyl (1R,3S,3aS,6aS)-1-(4-fluorophenyl)-3,5-dimethyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— Methyl 1-[2-[2-(2-oxo-1,3-benzoxazol-3-yl)acetyl]oxyacetyl]piperidine-4-carboxylate —— C18H20N2O7
    Methyl 1-[2-[2-(2-oxo-1,3-benzoxazol-3-yl)acetyl]oxyacetyl]piperidine-4-carboxylate
    —— methyl (1R,3S,3aS,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,3aS,6aS)-1-(2-methoxyphenyl)-5-methyl-4,6-dioxo-3-propyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— methyl (1R,3S,3aR,6aS)-3-ethyl-1-(furan-2-yl)-5-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C15H19N2O5+
    methyl (1R,3S,3aR,6aS)-3-ethyl-1-(furan-2-yl)-5-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— methyl (1S,3R,3aS,6aS)-3-benzyl-1-(4-fluorophenyl)-5-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C22H22FN2O4+
    methyl (1S,3R,3aS,6aS)-3-benzyl-1-(4-fluorophenyl)-5-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— methyl (1S,3S,3aR,6aS)-3,5-dimethyl-1-(4-methylphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C17H21N2O4+
    methyl (1S,3S,3aR,6aS)-3,5-dimethyl-1-(4-methylphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— methyl (1R,3S,3aR,6aS)-1-(4-chlorophenyl)-3-ethyl-5-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C17H20ClN2O4+
    methyl (1R,3S,3aR,6aS)-1-(4-chlorophenyl)-3-ethyl-5-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— methyl (1R,3S,3aR,6aS)-3-ethyl-1-(furan-2-yl)-5-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C15H18N2O5
    methyl (1R,3S,3aR,6aS)-3-ethyl-1-(furan-2-yl)-5-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— methyl (1R,3S,3aS,6aS)-1-(4-chlorophenyl)-3-ethyl-5-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C17H19ClN2O4
    methyl (1R,3S,3aS,6aS)-1-(4-chlorophenyl)-3-ethyl-5-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— methyl (1R,3S,3aS,6aS)-1-(furan-2-yl)-3,5-dimethyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C14H16N2O5
    methyl (1R,3S,3aS,6aS)-1-(furan-2-yl)-3,5-dimethyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— methyl (1R,3S,3aS,6aS)-3-ethyl-1-(4-hydroxyphenyl)-5-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C17H21N2O5+
    methyl (1R,3S,3aS,6aS)-3-ethyl-1-(4-hydroxyphenyl)-5-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— methyl (1R,3S,3aR,6aS)-1-(3-fluorophenyl)-3,5-dimethyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C16H17FN2O4
    methyl (1R,3S,3aR,6aS)-1-(3-fluorophenyl)-3,5-dimethyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— methyl (1R,3S,3aR,6aS)-1-(4-hydroxyphenyl)-3,5-dimethyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C16H18N2O5
    methyl (1R,3S,3aR,6aS)-1-(4-hydroxyphenyl)-3,5-dimethyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— methyl (1R,3S,3aS,6aS)-1-(2-methoxyphenyl)-3,5-dimethyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C17H21N2O5+
    methyl (1R,3S,3aS,6aS)-1-(2-methoxyphenyl)-3,5-dimethyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— methyl (1S,3S,3aR,6aR)-3,5-dimethyl-1-(4-methylphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C17H21N2O4+
    methyl (1S,3S,3aR,6aR)-3,5-dimethyl-1-(4-methylphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— methyl (1R,3S,3aR,6aS)-1-(4-fluorophenyl)-3,5-dimethyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C16H18FN2O4+
    methyl (1R,3S,3aR,6aS)-1-(4-fluorophenyl)-3,5-dimethyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— methyl (1R,3R,3aR,6aS)-1-(furan-2-yl)-3,5-dimethyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C14H16N2O5
    methyl (1R,3R,3aR,6aS)-1-(furan-2-yl)-3,5-dimethyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate