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    —— ethyl (1R,3R,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,3R,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,3R,3aS,6aS)-1-(4-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,3aS,6aS)-1-(4-fluorophenyl)-5-methyl-4,6-dioxo-3-phenyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— ethyl (1R,3R,3aS,6aS)-3-methyl-1-(2-methylphenyl)-4,6-dioxo-5-phenyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C23H24N2O4
    ethyl (1R,3R,3aS,6aS)-3-methyl-1-(2-methylphenyl)-4,6-dioxo-5-phenyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— ethyl (1S,3R,3aS,6aS)-5-ethyl-1-(furan-2-yl)-3-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C16H21N2O5+
    ethyl (1S,3R,3aS,6aS)-5-ethyl-1-(furan-2-yl)-3-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— ethyl (1R,3R,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,3R,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,3R,3aR,6aS)-3-(hydroxymethyl)-5-methyl-1-(2-methylphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C18H23N2O5+
    ethyl (1R,3R,3aR,6aS)-3-(hydroxymethyl)-5-methyl-1-(2-methylphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— ethyl (1R,3R,3aR,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 —— C19H25N2O5S+
    ethyl (1R,3R,3aR,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
    —— ethyl (1R,3S,3aS,6aS)-3,5-diethyl-1-(2-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-(2-fluorophenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— ethyl (1R,3R,3aR,6aS)-3-ethyl-1-(4-hydroxyphenyl)-5-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C18H23N2O5+
    ethyl (1R,3R,3aR,6aS)-3-ethyl-1-(4-hydroxyphenyl)-5-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— ethyl (1R,3R,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,3R,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)-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,3aS,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,3S,3aR,6aS)-1-(2-fluorophenyl)-5-methyl-4,6-dioxo-3-phenyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C22H21FN2O4
    ethyl (1R,3S,3aR,6aS)-1-(2-fluorophenyl)-5-methyl-4,6-dioxo-3-phenyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— ethyl (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 —— C22H23N2O5+
    ethyl (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
    —— ethyl (1R,3R,3aR,6aS)-3,5-dimethyl-1-(4-methylphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C18H23N2O4+
    ethyl (1R,3R,3aR,6aS)-3,5-dimethyl-1-(4-methylphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— ethyl (1R,3S,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 —— C17H22N2O4S2
    ethyl (1R,3S,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
    —— ethyl (1R,3R,3aS,6aS)-3-(hydroxymethyl)-5-methyl-1-(2-methylphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C18H23N2O5+
    ethyl (1R,3R,3aS,6aS)-3-(hydroxymethyl)-5-methyl-1-(2-methylphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— ethyl (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 —— C18H22N2O5
    ethyl (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
    —— ethyl (1R,3S,3aS,6aS)-1-(4-hydroxyphenyl)-3-methyl-4,6-dioxo-5-phenyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C22H22N2O5
    ethyl (1R,3S,3aS,6aS)-1-(4-hydroxyphenyl)-3-methyl-4,6-dioxo-5-phenyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— ethyl (1S,3R,3aS,6aS)-5-ethyl-3-methyl-4,6-dioxo-1-thiophen-2-yl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C16H20N2O4S
    ethyl (1S,3R,3aS,6aS)-5-ethyl-3-methyl-4,6-dioxo-1-thiophen-2-yl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— ethyl (1R,3R,3aR,6aS)-1-(2-fluorophenyl)-5-methyl-4,6-dioxo-3-phenyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C22H21FN2O4
    ethyl (1R,3R,3aR,6aS)-1-(2-fluorophenyl)-5-methyl-4,6-dioxo-3-phenyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— ethyl (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 —— C18H22FN2O4+
    ethyl (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
    —— ethyl (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 —— C18H22N2O5
    ethyl (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
    —— ethyl (1R,3S,3aS,6aS)-3,5-dimethyl-1-(4-methylphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C18H23N2O4+
    ethyl (1R,3S,3aS,6aS)-3,5-dimethyl-1-(4-methylphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— ethyl (1R,3R,3aR,6aS)-1-(2-fluorophenyl)-3,5-dimethyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C17H19FN2O4
    ethyl (1R,3R,3aR,6aS)-1-(2-fluorophenyl)-3,5-dimethyl-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]pyrrol-2-ium-3-carboxylate —— C17H21N2O6+
    ethyl (1R,3S,3aR,6aS)-3-(hydroxymethyl)-1-(4-hydroxyphenyl)-5-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— ethyl (1R,3S,3aS,6aS)-3-ethyl-1-(4-fluorophenyl)-5-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C18H21FN2O4
    ethyl (1R,3S,3aS,6aS)-3-ethyl-1-(4-fluorophenyl)-5-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— ethyl (1R,3R,3aR,6aS)-1-(4-fluorophenyl)-3,5-dimethyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C17H20FN2O4+
    ethyl (1R,3R,3aR,6aS)-1-(4-fluorophenyl)-3,5-dimethyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— ethyl (1R,3R,3aR,6aS)-1-(4-methoxyphenyl)-3,5-dimethyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C18H22N2O5
    ethyl (1R,3R,3aR,6aS)-1-(4-methoxyphenyl)-3,5-dimethyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— ethyl (1R,3R,3aS,6aS)-3-ethyl-1-(4-methoxyphenyl)-5-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C19H24N2O5
    ethyl (1R,3R,3aS,6aS)-3-ethyl-1-(4-methoxyphenyl)-5-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— ethyl (1R,3R,3aS,6aS)-1-(2,4-dimethoxyphenyl)-3-ethyl-5-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C20H26N2O6
    ethyl (1R,3R,3aS,6aS)-1-(2,4-dimethoxyphenyl)-3-ethyl-5-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— ethyl (1R,3S,3aS,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 —— C16H21N2O5+
    ethyl (1R,3S,3aS,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
    —— ethyl (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 —— C19H23FN2O4
    ethyl (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
    —— ethyl (1R,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 —— C23H24FN2O4+
    ethyl (1R,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
    —— ethyl (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 —— C19H24N2O5
    ethyl (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
    —— ethyl (1R,3S,3aR,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,3aR,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,3S,3aS,6aS)-3-benzyl-5-methyl-4,6-dioxo-1-thiophen-2-yl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C21H23N2O4S+
    ethyl (1R,3S,3aS,6aS)-3-benzyl-5-methyl-4,6-dioxo-1-thiophen-2-yl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— ethyl (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 —— C19H24N2O5
    ethyl (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
    —— ethyl 5-[2-[4-(2,5-dimethylthiophen-3-yl)-4-oxobutanoyl]oxyacetyl]-2,4-dimethyl-1H-pyrrole-3-carboxylate —— C21H25NO6S
    ethyl 5-[2-[4-(2,5-dimethylthiophen-3-yl)-4-oxobutanoyl]oxyacetyl]-2,4-dimethyl-1H-pyrrole-3-carboxylate
    —— ethyl (1R,3S,3aR,6aS)-3-(hydroxymethyl)-5-methyl-1-(2-methylphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C18H23N2O5+
    ethyl (1R,3S,3aR,6aS)-3-(hydroxymethyl)-5-methyl-1-(2-methylphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— ethyl (1R,3R,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 —— C18H23N2O5+
    ethyl (1R,3R,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
    —— ethyl (1R,3S,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 —— C19H25N2O5S+
    ethyl (1R,3S,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
    —— ethyl (1R,3S,3aS,6aS)-3-ethyl-1-(2-fluorophenyl)-5-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C18H22FN2O4+
    ethyl (1R,3S,3aS,6aS)-3-ethyl-1-(2-fluorophenyl)-5-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— ethyl (1R,3R,3aR,6aS)-3-butyl-1-(4-hydroxyphenyl)-5-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C20H27N2O5+
    ethyl (1R,3R,3aR,6aS)-3-butyl-1-(4-hydroxyphenyl)-5-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— ethyl (1R,3R,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 —— C19H25N2O5+
    ethyl (1R,3R,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
    —— ethyl (1R,3R,3aR,6aS)-3-ethyl-1-(4-fluorophenyl)-5-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C18H21FN2O4
    ethyl (1R,3R,3aR,6aS)-3-ethyl-1-(4-fluorophenyl)-5-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— ethyl (1R,3S,3aR,6aS)-1-(4-hydroxyphenyl)-5-methyl-4,6-dioxo-3-propyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C19H24N2O5
    ethyl (1R,3S,3aR,6aS)-1-(4-hydroxyphenyl)-5-methyl-4,6-dioxo-3-propyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— ethyl (1R,3R,3aR,6aS)-3-ethyl-1-(4-hydroxyphenyl)-5-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C18H22N2O5
    ethyl (1R,3R,3aR,6aS)-3-ethyl-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-(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,3S,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,3aR,6aS)-3-ethyl-1-(2-methoxyphenyl)-5-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C19H25N2O5+
    ethyl (1R,3S,3aR,6aS)-3-ethyl-1-(2-methoxyphenyl)-5-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— ethyl (1R,3S,3aR,6aS)-3-ethyl-1-(4-fluorophenyl)-5-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C18H21FN2O4
    ethyl (1R,3S,3aR,6aS)-3-ethyl-1-(4-fluorophenyl)-5-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate