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    —— methyl (1R,3S,3aR,6aS)-5-(2-fluorophenyl)-1-(furan-2-yl)-3-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C19H18FN2O5+
    methyl (1R,3S,3aR,6aS)-5-(2-fluorophenyl)-1-(furan-2-yl)-3-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— methyl (1R,3R,3aR,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,3aR,6aS)-1-(3-fluorophenyl)-3-(hydroxymethyl)-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-methyl-4,6-dioxo-5-phenyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C21H20FN2O4+
    methyl (1R,3S,3aR,6aS)-1-(2-fluorophenyl)-3-methyl-4,6-dioxo-5-phenyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— methyl (1R,3S,3aS,6aS)-3-butyl-4,6-dioxo-5-phenyl-1-thiophen-2-yl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C22H24N2O4S
    methyl (1R,3S,3aS,6aS)-3-butyl-4,6-dioxo-5-phenyl-1-thiophen-2-yl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— methyl (1R,3R,3aS,6aS)-5-(2-fluorophenyl)-1-(furan-2-yl)-3-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C19H17FN2O5
    methyl (1R,3R,3aS,6aS)-5-(2-fluorophenyl)-1-(furan-2-yl)-3-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— methyl (1S,3R,3aR,6aR)-3-(hydroxymethyl)-1-(4-methylphenyl)-4,6-dioxo-5-phenyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C22H23N2O5+
    methyl (1S,3R,3aR,6aR)-3-(hydroxymethyl)-1-(4-methylphenyl)-4,6-dioxo-5-phenyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-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]pyrrol-2-ium-3-carboxylate —— C23H25N2O4+
    methyl (1R,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,3aS,6aS)-5-(2-fluorophenyl)-1-(furan-2-yl)-3-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C19H18FN2O5+
    methyl (1R,3R,3aS,6aS)-5-(2-fluorophenyl)-1-(furan-2-yl)-3-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— methyl (1R,3R,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,3R,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 (1R,3R,3aS,6aS)-1,5-bis(4-methylphenyl)-4,6-dioxo-3-propyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C25H29N2O4+
    methyl (1R,3R,3aS,6aS)-1,5-bis(4-methylphenyl)-4,6-dioxo-3-propyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— methyl (1R,3R,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,3R,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,3S,3aR,6aS)-5-(2-fluorophenyl)-1-(furan-2-yl)-3-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C19H17FN2O5
    methyl (1R,3S,3aR,6aS)-5-(2-fluorophenyl)-1-(furan-2-yl)-3-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— methyl (1R,3R,3aR,6aS)-3-(hydroxymethyl)-1-(2-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-(2-methylphenyl)-4,6-dioxo-5-phenyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-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]pyrrole-3-carboxylate —— C23H24N2O5
    methyl (1R,3R,3aS,6aS)-3-ethyl-1-(4-hydroxyphenyl)-5-(4-methylphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— methyl (1S,3S,3aR,6aR)-5-(2-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,6aR)-5-(2-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,3aR,6aR)-3-(hydroxymethyl)-1-(4-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-(4-methylphenyl)-4,6-dioxo-5-phenyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— methyl (1R,3S,3aR,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,3aR,6aS)-3-butyl-1-(4-hydroxyphenyl)-4,6-dioxo-5-phenyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— methyl (1R,3S,3aS,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,3S,3aS,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 (2S,3S)-3-methyl-2-(3-methylbut-2-enoylamino)pentanoate —— C12H21NO3
    methyl (2S,3S)-3-methyl-2-(3-methylbut-2-enoylamino)pentanoate
    —— methyl (1R,3S,3aR,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,3S,3aR,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-butyl-4,6-dioxo-5-phenyl-1-thiophen-2-yl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C22H24N2O4S
    methyl (1R,3R,3aS,6aS)-3-butyl-4,6-dioxo-5-phenyl-1-thiophen-2-yl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— methyl (1S,3R,3aR,6aS)-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 (1S,3R,3aR,6aS)-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,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 (1R,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,3R,3aS,6aS)-1-(furan-2-yl)-3-methyl-5-(4-methylphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C20H20N2O5
    methyl (1R,3R,3aS,6aS)-1-(furan-2-yl)-3-methyl-5-(4-methylphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— methyl (1R,3R,3aR,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,3aR,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,3S,3aR,6aS)-1-(4-methoxyphenyl)-3-methyl-4,6-dioxo-5-phenyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C22H23N2O5+
    methyl (1R,3S,3aR,6aS)-1-(4-methoxyphenyl)-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-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,3aR,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 (1S,3S,3aR,6aS)-3-methyl-1,5-bis(4-methylphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C23H25N2O4+
    methyl (1S,3S,3aR,6aS)-3-methyl-1,5-bis(4-methylphenyl)-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-(hydroxymethyl)-4,6-dioxo-5-phenyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C21H19FN2O5
    methyl (1R,3S,3aR,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)-5-(2-fluorophenyl)-3-methyl-1-(2-methylphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C22H21FN2O4
    methyl (1S,3S,3aR,6aR)-5-(2-fluorophenyl)-3-methyl-1-(2-methylphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— methyl (1S,3R,3aS,6aS)-1-(4-hydroxyphenyl)-3-methyl-5-(4-methylphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C22H22N2O5
    methyl (1S,3R,3aS,6aS)-1-(4-hydroxyphenyl)-3-methyl-5-(4-methylphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— methyl (1S,3S,3aR,6aS)-5-(2-fluorophenyl)-3-methyl-1-(4-methylphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C22H21FN2O4
    methyl (1S,3S,3aR,6aS)-5-(2-fluorophenyl)-3-methyl-1-(4-methylphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— methyl (1R,3R,3aS,6aS)-1-(2-methoxyphenyl)-3-methyl-4,6-dioxo-5-phenyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C22H23N2O5+
    methyl (1R,3R,3aS,6aS)-1-(2-methoxyphenyl)-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-methyl-5-(4-methylphenyl)-4,6-dioxo-1-thiophen-2-yl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C20H21N2O4S+
    methyl (1R,3R,3aS,6aS)-3-methyl-5-(4-methylphenyl)-4,6-dioxo-1-thiophen-2-yl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— methyl (1R,3S,3aR,6aR)-5-(2-fluorophenyl)-3-methyl-1-(2-methylphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C22H21FN2O4
    methyl (1R,3S,3aR,6aR)-5-(2-fluorophenyl)-3-methyl-1-(2-methylphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— methyl (1R,3R,3aR,6aS)-3-butyl-4,6-dioxo-5-phenyl-1-thiophen-2-yl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C22H24N2O4S
    methyl (1R,3R,3aR,6aS)-3-butyl-4,6-dioxo-5-phenyl-1-thiophen-2-yl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— methyl (1S,3S,3aR,6aR)-3-methyl-1,5-bis(4-methylphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C23H25N2O4+
    methyl (1S,3S,3aR,6aR)-3-methyl-1,5-bis(4-methylphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— methyl (1R,3S,3aS,6aS)-3-butyl-4,6-dioxo-5-phenyl-1-thiophen-2-yl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C22H25N2O4S+
    methyl (1R,3S,3aS,6aS)-3-butyl-4,6-dioxo-5-phenyl-1-thiophen-2-yl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— methyl 2-[(2S,5R)-5-(butylcarbamoyl)-2-methylpiperidin-1-yl]acetate —— C14H26N2O3
    methyl 2-[(2S,5R)-5-(butylcarbamoyl)-2-methylpiperidin-1-yl]acetate
    —— methyl (1S,3S,3aR,6aS)-5-(2-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-(2-fluorophenyl)-3-methyl-1-(2-methylphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— methyl (1R,3S,3aR,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,3S,3aR,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 (1S,3R,3aS,6aS)-1-(furan-2-yl)-3-methyl-5-(4-methylphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C20H21N2O5+
    methyl (1S,3R,3aS,6aS)-1-(furan-2-yl)-3-methyl-5-(4-methylphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— methyl (1R,3S,3aR,6aS)-3-butyl-4,6-dioxo-5-phenyl-1-thiophen-2-yl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C22H24N2O4S
    methyl (1R,3S,3aR,6aS)-3-butyl-4,6-dioxo-5-phenyl-1-thiophen-2-yl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— methyl (1R,3S,3aS,6aS)-5-(2-fluorophenyl)-1-(furan-2-yl)-3-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C19H18FN2O5+
    methyl (1R,3S,3aS,6aS)-5-(2-fluorophenyl)-1-(furan-2-yl)-3-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— methyl (1R,3R,3aR,6aS)-5-(2-fluorophenyl)-1-(furan-2-yl)-3-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C19H17FN2O5
    methyl (1R,3R,3aR,6aS)-5-(2-fluorophenyl)-1-(furan-2-yl)-3-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— methyl (1S,3R,3aS,6aS)-1-(4-hydroxyphenyl)-3-methyl-5-(4-methylphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C22H23N2O5+
    methyl (1S,3R,3aS,6aS)-1-(4-hydroxyphenyl)-3-methyl-5-(4-methylphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— methyl (1R,3S,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,3S,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,3S,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,3S,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,3S,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,3S,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 (1S,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 (1S,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