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    —— methyl (1R,3R,3aR,6aS)-3-ethyl-1-(4-hydroxyphenyl)-5-(4-methylphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C23H24N2O5
    methyl (1R,3R,3aR,6aS)-3-ethyl-1-(4-hydroxyphenyl)-5-(4-methylphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— methyl (1R,3R,3aR,6aS)-1-(4-chlorophenyl)-3-methyl-4,6-dioxo-5-phenyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C21H20ClN2O4+
    methyl (1R,3R,3aR,6aS)-1-(4-chlorophenyl)-3-methyl-4,6-dioxo-5-phenyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— methyl (1S,3R,3aR,6aS)-3-(hydroxymethyl)-1-(4-methylphenyl)-4,6-dioxo-5-phenyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C22H22N2O5
    methyl (1S,3R,3aR,6aS)-3-(hydroxymethyl)-1-(4-methylphenyl)-4,6-dioxo-5-phenyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— methyl (1S,3R,3aS,6aS)-1-(4-fluorophenyl)-3-methyl-5-(4-methylphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C22H21FN2O4
    methyl (1S,3R,3aS,6aS)-1-(4-fluorophenyl)-3-methyl-5-(4-methylphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— methyl (1R,3S,3aS,6aS)-1-(2-fluorophenyl)-3-(hydroxymethyl)-4,6-dioxo-5-phenyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C21H19FN2O5
    methyl (1R,3S,3aS,6aS)-1-(2-fluorophenyl)-3-(hydroxymethyl)-4,6-dioxo-5-phenyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— methyl (1R,3S,3aS,6aS)-3-butyl-1-(4-hydroxyphenyl)-4,6-dioxo-5-phenyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C24H27N2O5+
    methyl (1R,3S,3aS,6aS)-3-butyl-1-(4-hydroxyphenyl)-4,6-dioxo-5-phenyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— methyl (1S,3S,3aR,6aS)-5-(4-fluorophenyl)-3-methyl-1-(2-methylphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C22H22FN2O4+
    methyl (1S,3S,3aR,6aS)-5-(4-fluorophenyl)-3-methyl-1-(2-methylphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— methyl (1R,3R,3aS,6aS)-3-methyl-1-(3-methylphenyl)-5-(4-methylphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C23H24N2O4
    methyl (1R,3R,3aS,6aS)-3-methyl-1-(3-methylphenyl)-5-(4-methylphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— methyl (1R,3S,3aR,6aS)-5-(2-fluorophenyl)-3-methyl-1-(4-methylphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C22H22FN2O4+
    methyl (1R,3S,3aR,6aS)-5-(2-fluorophenyl)-3-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)-3-methyl-4,6-dioxo-5-phenyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C21H20FN2O4+
    methyl (1R,3R,3aS,6aS)-1-(4-fluorophenyl)-3-methyl-4,6-dioxo-5-phenyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— methyl (1S,3R,3aS,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 —— C23H25N2O4+
    methyl (1S,3R,3aS,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
    —— methyl (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 —— C21H21N2O5+
    methyl (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
    —— methyl (1R,3R,3aR,6aS)-3-ethyl-5-(4-fluorophenyl)-1-(furan-2-yl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C20H19FN2O5
    methyl (1R,3R,3aR,6aS)-3-ethyl-5-(4-fluorophenyl)-1-(furan-2-yl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— methyl (1R,3R,3aS,6aS)-3-methyl-1-(2-methylphenyl)-5-(4-methylphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C23H24N2O4
    methyl (1R,3R,3aS,6aS)-3-methyl-1-(2-methylphenyl)-5-(4-methylphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— methyl (1R,3R,3aR,6aS)-3-ethyl-5-(4-fluorophenyl)-1-(furan-2-yl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C20H20FN2O5+
    methyl (1R,3R,3aR,6aS)-3-ethyl-5-(4-fluorophenyl)-1-(furan-2-yl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— methyl (1R,3S,3aR,6aS)-1-(furan-2-yl)-3-methyl-4,6-dioxo-5-phenyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C19H19N2O5+
    methyl (1R,3S,3aR,6aS)-1-(furan-2-yl)-3-methyl-4,6-dioxo-5-phenyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— methyl (1R,3R,3aR,6aS)-3-(hydroxymethyl)-1-(4-methylphenyl)-4,6-dioxo-5-phenyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C22H22N2O5
    methyl (1R,3R,3aR,6aS)-3-(hydroxymethyl)-1-(4-methylphenyl)-4,6-dioxo-5-phenyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— methyl (1R,3S,3aR,6aS)-5-methyl-1-(2-methylphenyl)-3-(2-methylsulfanylethyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C19H24N2O4S
    methyl (1R,3S,3aR,6aS)-5-methyl-1-(2-methylphenyl)-3-(2-methylsulfanylethyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— methyl (1R,3S,3aS,6aS)-3,5-diethyl-1-(2-fluorophenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C18H21FN2O4
    methyl (1R,3S,3aS,6aS)-3,5-diethyl-1-(2-fluorophenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— methyl (1R,3R,3aR,6aS)-3,5-diethyl-1-(2-methoxyphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C19H24N2O5
    methyl (1R,3R,3aR,6aS)-3,5-diethyl-1-(2-methoxyphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— methyl (1R,3S,3aR,6aR)-3-methyl-1,5-bis(4-methylphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C23H24N2O4
    methyl (1R,3S,3aR,6aR)-3-methyl-1,5-bis(4-methylphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— methyl (1S,3S,3aR,6aS)-5-(4-fluorophenyl)-3-methyl-1-(3-methylphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C22H21FN2O4
    methyl (1S,3S,3aR,6aS)-5-(4-fluorophenyl)-3-methyl-1-(3-methylphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— methyl (1S,3R,3aS,6aS)-3-methyl-5-(4-methylphenyl)-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-methyl-5-(4-methylphenyl)-4,6-dioxo-1-thiophen-2-yl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— methyl (1R,3R,3aR,6aS)-3,5-diethyl-1-(4-methylphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C19H25N2O4+
    methyl (1R,3R,3aR,6aS)-3,5-diethyl-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-(3-fluorophenyl)-3-(hydroxymethyl)-4,6-dioxo-5-phenyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C21H19FN2O5
    methyl (1R,3S,3aS,6aS)-1-(3-fluorophenyl)-3-(hydroxymethyl)-4,6-dioxo-5-phenyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— methyl (1S,3S,3aR,6aR)-3-methyl-1-(2-methylphenyl)-4,6-dioxo-5-phenyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C22H22N2O4
    methyl (1S,3S,3aR,6aR)-3-methyl-1-(2-methylphenyl)-4,6-dioxo-5-phenyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— methyl (1R,3S,3aR,6aS)-1-(2-fluorophenyl)-3-(hydroxymethyl)-4,6-dioxo-5-phenyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C21H19FN2O5
    methyl (1R,3S,3aR,6aS)-1-(2-fluorophenyl)-3-(hydroxymethyl)-4,6-dioxo-5-phenyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— methyl 3-(4-chlorophenyl)-1-methyl-4,6-dioxo-5-phenyloctahydropyrrolo[3,4-c]pyrrole-1-carboxylate —— C21H19ClN2O4
    methyl 3-(4-chlorophenyl)-1-methyl-4,6-dioxo-5-phenyloctahydropyrrolo[3,4-c]pyrrole-1-carboxylate
    —— methyl (1R,3R,3aR,6aR)-3-(hydroxymethyl)-1-(2-methylphenyl)-4,6-dioxo-5-phenyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C22H23N2O5+
    methyl (1R,3R,3aR,6aR)-3-(hydroxymethyl)-1-(2-methylphenyl)-4,6-dioxo-5-phenyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— methyl (1R,3R,3aS,6aS)-1-(4-chlorophenyl)-3-methyl-4,6-dioxo-5-phenyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C21H20ClN2O4+
    methyl (1R,3R,3aS,6aS)-1-(4-chlorophenyl)-3-methyl-4,6-dioxo-5-phenyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— methyl (1R,3R,3aS,6aS)-3-ethyl-1-(4-hydroxyphenyl)-5-(4-methylphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C23H25N2O5+
    methyl (1R,3R,3aS,6aS)-3-ethyl-1-(4-hydroxyphenyl)-5-(4-methylphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— methyl (1R,3R,3aR,6aS)-5-ethyl-1-(4-hydroxyphenyl)-4,6-dioxo-3-propyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C19H25N2O5+
    methyl (1R,3R,3aR,6aS)-5-ethyl-1-(4-hydroxyphenyl)-4,6-dioxo-3-propyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— methyl (1R,3S,3aS,6aS)-1-(furan-2-yl)-3-methyl-4,6-dioxo-5-phenyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C19H19N2O5+
    methyl (1R,3S,3aS,6aS)-1-(furan-2-yl)-3-methyl-4,6-dioxo-5-phenyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— methyl (1R,3S,3aR,6aS)-3,5-diethyl-1-(4-hydroxyphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C18H22N2O5
    methyl (1R,3S,3aR,6aS)-3,5-diethyl-1-(4-hydroxyphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— methyl (1R,3S,3aS,6aS)-3-butyl-1-(4-hydroxyphenyl)-4,6-dioxo-5-phenyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C24H26N2O5
    methyl (1R,3S,3aS,6aS)-3-butyl-1-(4-hydroxyphenyl)-4,6-dioxo-5-phenyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— methyl (1R,3R,3aS,6aS)-5-(4-fluorophenyl)-4,6-dioxo-3-propyl-1-thiophen-2-yl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C21H22FN2O4S+
    methyl (1R,3R,3aS,6aS)-5-(4-fluorophenyl)-4,6-dioxo-3-propyl-1-thiophen-2-yl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— methyl (1R,3S,3aS,6aS)-1-(4-chlorophenyl)-3-methyl-4,6-dioxo-5-phenyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C21H20ClN2O4+
    methyl (1R,3S,3aS,6aS)-1-(4-chlorophenyl)-3-methyl-4,6-dioxo-5-phenyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— methyl (1R,3R,3aR,6aS)-5-(2-fluorophenyl)-3-methyl-4,6-dioxo-1-thiophen-2-yl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C19H17FN2O4S
    methyl (1R,3R,3aR,6aS)-5-(2-fluorophenyl)-3-methyl-4,6-dioxo-1-thiophen-2-yl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— methyl (1R,3R,3aS,6aS)-1-(3-fluorophenyl)-3-(hydroxymethyl)-4,6-dioxo-5-phenyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C21H19FN2O5
    methyl (1R,3R,3aS,6aS)-1-(3-fluorophenyl)-3-(hydroxymethyl)-4,6-dioxo-5-phenyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— methyl (1R,3R,3aS,6aS)-3,5-diethyl-1-(2-fluorophenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C18H22FN2O4+
    methyl (1R,3R,3aS,6aS)-3,5-diethyl-1-(2-fluorophenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— methyl (1S,3S,3aR,6aS)-5-methyl-1-(2-methylphenyl)-3-(2-methylsulfanylethyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C19H24N2O4S
    methyl (1S,3S,3aR,6aS)-5-methyl-1-(2-methylphenyl)-3-(2-methylsulfanylethyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— methyl (1R,3R,3aS,6aS)-3,5-diethyl-1-(2-methoxyphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C19H25N2O5+
    methyl (1R,3R,3aS,6aS)-3,5-diethyl-1-(2-methoxyphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— methyl (1R,3S,3aR,6aS)-1-(4-chlorophenyl)-3,5-diethyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C18H22ClN2O4+
    methyl (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
    —— methyl (1S,3S,3aR,6aS)-5-methyl-1-(4-methylphenyl)-3-(2-methylsulfanylethyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C19H24N2O4S
    methyl (1S,3S,3aR,6aS)-5-methyl-1-(4-methylphenyl)-3-(2-methylsulfanylethyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— methyl (1R,3S,3aR,6aS)-3,5-diethyl-1-(2-fluorophenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C18H21FN2O4
    methyl (1R,3S,3aR,6aS)-3,5-diethyl-1-(2-fluorophenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— methyl (1R,3S,3aS,6aS)-5-ethyl-1-(4-hydroxyphenyl)-4,6-dioxo-3-propyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C19H25N2O5+
    methyl (1R,3S,3aS,6aS)-5-ethyl-1-(4-hydroxyphenyl)-4,6-dioxo-3-propyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— methyl 2,4-dimethyl-5-[(2R)-2-[2-(2-oxo-1,3-benzoxazol-3-yl)acetyl]oxypropanoyl]-1H-pyrrole-3-carboxylate —— C20H20N2O7
    methyl 2,4-dimethyl-5-[(2R)-2-[2-(2-oxo-1,3-benzoxazol-3-yl)acetyl]oxypropanoyl]-1H-pyrrole-3-carboxylate
    —— methyl (1R,3R,3aS,6aS)-5-(2-fluorophenyl)-1-(4-hydroxyphenyl)-3-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C21H20FN2O5+
    methyl (1R,3R,3aS,6aS)-5-(2-fluorophenyl)-1-(4-hydroxyphenyl)-3-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— methyl (1R,3R,3aS,6aS)-3,5-diethyl-1-(2-methoxyphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C19H24N2O5
    methyl (1R,3R,3aS,6aS)-3,5-diethyl-1-(2-methoxyphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-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]pyrrol-2-ium-3-carboxylate —— C16H21N2O4S2+
    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]pyrrol-2-ium-3-carboxylate