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    —— ethyl (1S,3S,3aS,6aS)-5-ethyl-4,6-dioxo-3-phenyl-1-thiophen-2-yl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C21H23N2O4S+
    ethyl (1S,3S,3aS,6aS)-5-ethyl-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,3aR,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,3aR,6aS)-3,5-diethyl-1-(4-hydroxyphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— ethyl (1R,3R,3aS,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,3R,3aS,6aS)-3,5-diethyl-1-(furan-2-yl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— ethyl (1S,3R,3aS,6aS)-5-ethyl-3-(2-methylsulfanylethyl)-4,6-dioxo-1-thiophen-2-yl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C18H24N2O4S2
    ethyl (1S,3R,3aS,6aS)-5-ethyl-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)-5-ethyl-4,6-dioxo-3-propyl-1-thiophen-2-yl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C18H24N2O4S
    ethyl (1R,3R,3aS,6aS)-5-ethyl-4,6-dioxo-3-propyl-1-thiophen-2-yl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— ethyl (1R,3R,3aR,6aS)-3-methyl-4,6-dioxo-5-phenyl-1-thiophen-2-yl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C20H21N2O4S+
    ethyl (1R,3R,3aR,6aS)-3-methyl-4,6-dioxo-5-phenyl-1-thiophen-2-yl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— ethyl (1S,3S,3aS,6aS)-5-ethyl-1-(4-fluorophenyl)-4,6-dioxo-3-phenyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C23H23FN2O4
    ethyl (1S,3S,3aS,6aS)-5-ethyl-1-(4-fluorophenyl)-4,6-dioxo-3-phenyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— ethyl (1R,3R,3aR,6aS)-1-(4-hydroxyphenyl)-3-methyl-4,6-dioxo-5-phenyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C22H23N2O5+
    ethyl (1R,3R,3aR,6aS)-1-(4-hydroxyphenyl)-3-methyl-4,6-dioxo-5-phenyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— ethyl (1R,3R,3aR,6aS)-3-methyl-4,6-dioxo-5-phenyl-1-thiophen-2-yl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C20H20N2O4S
    ethyl (1R,3R,3aR,6aS)-3-methyl-4,6-dioxo-5-phenyl-1-thiophen-2-yl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— ethyl (1R,3R,3aS,6aS)-3-butyl-5-ethyl-1-(2-methoxyphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C22H31N2O5+
    ethyl (1R,3R,3aS,6aS)-3-butyl-5-ethyl-1-(2-methoxyphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— ethyl (1R,3R,3aR,6aS)-1-(2-fluorophenyl)-4,6-dioxo-5-phenyl-3-propyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C24H25FN2O4
    ethyl (1R,3R,3aR,6aS)-1-(2-fluorophenyl)-4,6-dioxo-5-phenyl-3-propyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— ethyl (1R,3R,3aS,6aS)-3,5-diethyl-1-(4-fluorophenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C19H23FN2O4
    ethyl (1R,3R,3aS,6aS)-3,5-diethyl-1-(4-fluorophenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— ethyl (1R,3S,3aS,6aS)-5-ethyl-4,6-dioxo-3-phenyl-1-thiophen-2-yl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C21H23N2O4S+
    ethyl (1R,3S,3aS,6aS)-5-ethyl-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)-3-methyl-1-(2-methylphenyl)-4,6-dioxo-5-phenyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C23H25N2O4+
    ethyl (1R,3R,3aS,6aS)-3-methyl-1-(2-methylphenyl)-4,6-dioxo-5-phenyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— ethyl (1R,3S,3aR,6aS)-3-methyl-1-(2-methylphenyl)-5-(4-methylphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C24H27N2O4+
    ethyl (1R,3S,3aR,6aS)-3-methyl-1-(2-methylphenyl)-5-(4-methylphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— ethyl (1R,3R,3aS,6aS)-1-(2-methylphenyl)-4,6-dioxo-5-phenyl-3-propyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C25H28N2O4
    ethyl (1R,3R,3aS,6aS)-1-(2-methylphenyl)-4,6-dioxo-5-phenyl-3-propyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— ethyl (1R,3S,3aS,6aS)-5-ethyl-1-(4-fluorophenyl)-4,6-dioxo-3-phenyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C23H24FN2O4+
    ethyl (1R,3S,3aS,6aS)-5-ethyl-1-(4-fluorophenyl)-4,6-dioxo-3-phenyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— ethyl (1R,3R,3aR,6aS)-3-methyl-1-(2-methylphenyl)-5-(4-methylphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C24H26N2O4
    ethyl (1R,3R,3aR,6aS)-3-methyl-1-(2-methylphenyl)-5-(4-methylphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— ethyl (1S,3R,3aS,6aS)-1-(4-chlorophenyl)-5-ethyl-3-(2-methylsulfanylethyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C20H26ClN2O4S+
    ethyl (1S,3R,3aS,6aS)-1-(4-chlorophenyl)-5-ethyl-3-(2-methylsulfanylethyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— ethyl (1R,3S,3aR,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,3S,3aR,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 (1R,3R,3aR,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,3aR,6aS)-3-methyl-1-(2-methylphenyl)-4,6-dioxo-5-phenyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— ethyl (1R,3S,3aS,6aS)-1-(2-fluorophenyl)-3-methyl-4,6-dioxo-5-phenyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C22H21FN2O4
    ethyl (1R,3S,3aS,6aS)-1-(2-fluorophenyl)-3-methyl-4,6-dioxo-5-phenyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— ethyl (4S)-4-methyl-2-oxo-6-[[2-(2-oxo-1,3-benzoxazol-3-yl)acetyl]oxymethyl]-3,4-dihydro-1H-pyrimidine-5-carboxylate —— C18H19N3O7
    ethyl (4S)-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,3aR,6aS)-3,5-diethyl-1-(furan-2-yl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C17H23N2O5+
    ethyl (1R,3R,3aR,6aS)-3,5-diethyl-1-(furan-2-yl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— ethyl (1R,3R,3aS,6aS)-5-ethyl-1-(2-fluorophenyl)-3-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C18H21FN2O4
    ethyl (1R,3R,3aS,6aS)-5-ethyl-1-(2-fluorophenyl)-3-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— ethyl (4R)-4-methyl-6-[[(5S)-5-methyl-4,5,6,7-tetrahydro-1-benzothiophene-2-carbonyl]oxymethyl]-2-oxo-3,4-dihydro-1H-pyrimidine-5-carboxylate —— C19H24N2O5S
    ethyl (4R)-4-methyl-6-[[(5S)-5-methyl-4,5,6,7-tetrahydro-1-benzothiophene-2-carbonyl]oxymethyl]-2-oxo-3,4-dihydro-1H-pyrimidine-5-carboxylate
    —— ethyl (1R,3R,3aR,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,3aR,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,3aS,6aS)-1-(3-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-(3-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-methyl-3-(2-methylsulfanylethyl)-4,6-dioxo-1-thiophen-2-yl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C17H23N2O4S2+
    ethyl (1R,3R,3aS,6aS)-5-methyl-3-(2-methylsulfanylethyl)-4,6-dioxo-1-thiophen-2-yl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-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]pyrrol-2-ium-3-carboxylate —— C19H25N2O4+
    ethyl (1S,3R,3aS,6aS)-5-ethyl-3-methyl-1-(4-methylphenyl)-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]pyrrol-2-ium-3-carboxylate —— C16H21N2O5+
    ethyl (1R,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,3S,3aR,6aS)-3-methyl-1-(3-methylphenyl)-4,6-dioxo-5-phenyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C23H25N2O4+
    ethyl (1R,3S,3aR,6aS)-3-methyl-1-(3-methylphenyl)-4,6-dioxo-5-phenyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-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]pyrrol-2-ium-3-carboxylate —— C19H24FN2O4S+
    ethyl (1R,3S,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,3R,3aS,6aS)-1-(2-methylphenyl)-4,6-dioxo-5-phenyl-3-propyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C25H29N2O4+
    ethyl (1R,3R,3aS,6aS)-1-(2-methylphenyl)-4,6-dioxo-5-phenyl-3-propyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— ethyl (1R,3S,3aS,6aS)-3,5-diethyl-1-(4-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-(4-fluorophenyl)-4,6-dioxo-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]pyrrol-2-ium-3-carboxylate —— C16H21N2O4S+
    ethyl (1S,3R,3aS,6aS)-5-ethyl-3-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)-1-(3-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-(3-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,3aS,6aS)-1-(4-hydroxyphenyl)-3-methyl-4,6-dioxo-5-phenyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C22H23N2O5+
    ethyl (1R,3S,3aS,6aS)-1-(4-hydroxyphenyl)-3-methyl-4,6-dioxo-5-phenyl-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]pyrrole-3-carboxylate —— C19H23FN2O4S
    ethyl (1R,3S,3aS,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)-3,5-diethyl-1-(3-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-(3-fluorophenyl)-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-(2-fluorophenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C19H24FN2O4+
    ethyl (1R,3S,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 (1R,3R,3aS,6aS)-3-methyl-1-(3-methylphenyl)-4,6-dioxo-5-phenyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C23H25N2O4+
    ethyl (1R,3R,3aS,6aS)-3-methyl-1-(3-methylphenyl)-4,6-dioxo-5-phenyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— ethyl (1R,3R,3aR,6aS)-3-methyl-1-(4-methylphenyl)-4,6-dioxo-5-phenyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C23H24N2O4
    ethyl (1R,3R,3aR,6aS)-3-methyl-1-(4-methylphenyl)-4,6-dioxo-5-phenyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— ethyl (1R,3S,3aS,6aS)-3,5-diethyl-1-(4-methoxyphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C20H27N2O5+
    ethyl (1R,3S,3aS,6aS)-3,5-diethyl-1-(4-methoxyphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— ethyl (1R,3R,3aS,6aS)-5-(4-fluorophenyl)-1-(furan-2-yl)-3-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C20H20FN2O5+
    ethyl (1R,3R,3aS,6aS)-5-(4-fluorophenyl)-1-(furan-2-yl)-3-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— ethyl (1R,3S,3aR,6aS)-5-ethyl-4,6-dioxo-3-propyl-1-thiophen-2-yl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C18H24N2O4S
    ethyl (1R,3S,3aR,6aS)-5-ethyl-4,6-dioxo-3-propyl-1-thiophen-2-yl-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]pyrrol-2-ium-3-carboxylate —— C19H24ClN2O4S+
    ethyl (1R,3S,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]pyrrole-3-carboxylate —— C19H24N2O5
    ethyl (1S,3R,3aS,6aS)-5-ethyl-1-(4-methoxyphenyl)-3-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— ethyl (1R,3S,3aS,6aS)-5-ethyl-1-(4-fluorophenyl)-4,6-dioxo-3-phenyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C23H23FN2O4
    ethyl (1R,3S,3aS,6aS)-5-ethyl-1-(4-fluorophenyl)-4,6-dioxo-3-phenyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— ethyl (1R,3R,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,3R,3aR,6aS)-3,5-diethyl-4,6-dioxo-1-thiophen-2-yl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate