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    中文名称 英文名称 CAS号 化学式 结构式图片
    —— ethyl (6R)-3-butyl-6-[4-(cyclopropanecarbonylamino)phenyl]-4-methyl-2-oxo-1,6-dihydropyrimidine-5-carboxylate —— C22H29N3O4
    ethyl (6R)-3-butyl-6-[4-(cyclopropanecarbonylamino)phenyl]-4-methyl-2-oxo-1,6-dihydropyrimidine-5-carboxylate
    —— (E)-N-[(1S)-1-(1-adamantyl)ethyl]-3-(4-methylphenyl)prop-2-enamide —— C22H29NO
    (E)-N-[(1S)-1-(1-adamantyl)ethyl]-3-(4-methylphenyl)prop-2-enamide
    —— ethyl (1R,3S,3aS,6aS)-5-(4-methoxyphenyl)-3-methyl-4,6-dioxo-1-thiophen-2-yl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C21H23N2O5S+
    ethyl (1R,3S,3aS,6aS)-5-(4-methoxyphenyl)-3-methyl-4,6-dioxo-1-thiophen-2-yl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— ethyl (1R,3R,3aR,6aS)-5-(3-methoxyphenyl)-3-methyl-4,6-dioxo-1-thiophen-2-yl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C21H23N2O5S+
    ethyl (1R,3R,3aR,6aS)-5-(3-methoxyphenyl)-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-(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,3S,3aR,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 (1S,3R,3aS,6aS)-3-benzyl-5-ethyl-4,6-dioxo-1-thiophen-2-yl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C22H24N2O4S
    ethyl (1S,3R,3aS,6aS)-3-benzyl-5-ethyl-4,6-dioxo-1-thiophen-2-yl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— ethyl (1S,3R,3aS,6aS)-1-(2,4-dimethoxyphenyl)-5-ethyl-3-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C20H27N2O6+
    ethyl (1S,3R,3aS,6aS)-1-(2,4-dimethoxyphenyl)-5-ethyl-3-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— (E)-3-(2-methoxyphenyl)-N-[(7R)-5-oxo-7-phenyl-6,7-dihydro-4H-[1,2,4]triazolo[1,5-a]pyrimidin-2-yl]prop-2-enamide —— C21H19N5O3
    (E)-3-(2-methoxyphenyl)-N-[(7R)-5-oxo-7-phenyl-6,7-dihydro-4H-[1,2,4]triazolo[1,5-a]pyrimidin-2-yl]prop-2-enamide
    —— ethyl (1R,3R,3aS,6aS)-1-(2,4-dimethoxyphenyl)-5-ethyl-3-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)-5-ethyl-3-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— ethyl (1R,3R,3aS,6aS)-5-ethyl-3-methyl-1-(3-methylthiophen-2-yl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C17H22N2O4S
    ethyl (1R,3R,3aS,6aS)-5-ethyl-3-methyl-1-(3-methylthiophen-2-yl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— ethyl (1R,3R,3aS,6aS)-5-(4-methoxyphenyl)-3-methyl-4,6-dioxo-1-thiophen-2-yl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C21H23N2O5S+
    ethyl (1R,3R,3aS,6aS)-5-(4-methoxyphenyl)-3-methyl-4,6-dioxo-1-thiophen-2-yl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— ethyl (1R,3R,3aS,6aS)-3-benzyl-5-ethyl-1-(2-methylphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C25H28N2O4
    ethyl (1R,3R,3aS,6aS)-3-benzyl-5-ethyl-1-(2-methylphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— Ethyl 2-amino-6-[2-(tert-butylamino)-2-oxoethyl]sulfanyl-5-cyanopyridin-1-ium-3-carboxylate —— C15H21N4O3S+
    Ethyl 2-amino-6-[2-(tert-butylamino)-2-oxoethyl]sulfanyl-5-cyanopyridin-1-ium-3-carboxylate
    —— (E,2S)-5,5-dimethyl-2-[4-(pyridin-3-ylmethyl)piperazin-1-yl]hex-3-enoic acid —— C18H27N3O2
    (E,2S)-5,5-dimethyl-2-[4-(pyridin-3-ylmethyl)piperazin-1-yl]hex-3-enoic acid
    —— (E,2R)-5,5-dimethyl-2-[4-(pyridin-3-ylmethyl)piperazin-1-yl]hex-3-enoic acid —— C18H27N3O2
    (E,2R)-5,5-dimethyl-2-[4-(pyridin-3-ylmethyl)piperazin-1-yl]hex-3-enoic acid
    —— Ethyl 4-[(3-methyl-2-sulfanylidenebenzimidazol-1-yl)methyl]piperazin-4-ium-1-carboxylate —— C16H23N4O2S+
    Ethyl 4-[(3-methyl-2-sulfanylidenebenzimidazol-1-yl)methyl]piperazin-4-ium-1-carboxylate
    —— ethyl (4S)-6-(naphthalen-2-ylsulfanylmethyl)-2-oxo-4-phenyl-3,4-dihydro-1H-pyrimidine-5-carboxylate —— C24H22N2O3S
    ethyl (4S)-6-(naphthalen-2-ylsulfanylmethyl)-2-oxo-4-phenyl-3,4-dihydro-1H-pyrimidine-5-carboxylate
    —— ethyl 2,5-dimethyl-4-(2-naphthalen-2-ylsulfanylacetyl)-1H-pyrrole-3-carboxylate —— C21H21NO3S
    ethyl 2,5-dimethyl-4-(2-naphthalen-2-ylsulfanylacetyl)-1H-pyrrole-3-carboxylate
    —— ethyl (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 —— C21H23N2O4S+
    ethyl (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
    —— ethyl (1R,3R,3aR,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 —— C21H23N2O5+
    ethyl (1R,3R,3aR,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
    —— ethyl (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 —— C21H22N2O5
    ethyl (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
    —— ethyl (1R,3R,3aR,6aS)-4,6-dioxo-5-phenyl-3-propyl-1-thiophen-2-yl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C22H24N2O4S
    ethyl (1R,3R,3aR,6aS)-4,6-dioxo-5-phenyl-3-propyl-1-thiophen-2-yl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— ethyl (1R,3R,3aR,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 —— C21H23N2O4S+
    ethyl (1R,3R,3aR,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
    —— ethyl (1R,3S,3aS,6aS)-1-(2,4-dimethoxyphenyl)-5-ethyl-3-(hydroxymethyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C20H27N2O7+
    ethyl (1R,3S,3aS,6aS)-1-(2,4-dimethoxyphenyl)-5-ethyl-3-(hydroxymethyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— ethyl (1R,3R,3aS,6aS)-1-(4-chlorophenyl)-5-ethyl-3-(2-methylsulfanylethyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C20H25ClN2O4S
    ethyl (1R,3R,3aS,6aS)-1-(4-chlorophenyl)-5-ethyl-3-(2-methylsulfanylethyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— ethyl (1R,3S,3aR,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,3S,3aR,6aS)-1-(2-methylphenyl)-4,6-dioxo-5-phenyl-3-propyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— ethyl (1R,3R,3aS,6aS)-4,6-dioxo-5-phenyl-3-propyl-1-thiophen-2-yl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C22H25N2O4S+
    ethyl (1R,3R,3aS,6aS)-4,6-dioxo-5-phenyl-3-propyl-1-thiophen-2-yl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— ethyl (1R,3R,3aS,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,3aS,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 (1R,3R,3aR,6aS)-3-methyl-1-(3-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-(3-methylphenyl)-4,6-dioxo-5-phenyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— ethyl 2,5-dimethyl-4-[2-[(5R)-5-methyl-4,5,6,7-tetrahydro-1-benzothiophene-2-carbonyl]oxyacetyl]-1H-pyrrole-3-carboxylate —— C21H25NO5S
    ethyl 2,5-dimethyl-4-[2-[(5R)-5-methyl-4,5,6,7-tetrahydro-1-benzothiophene-2-carbonyl]oxyacetyl]-1H-pyrrole-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]pyrrole-3-carboxylate —— C23H24N2O4
    ethyl (1R,3R,3aS,6aS)-3-methyl-1-(3-methylphenyl)-4,6-dioxo-5-phenyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— ethyl (1R,3R,3aR,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,3R,3aR,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)-1-(2-fluorophenyl)-3-methyl-4,6-dioxo-5-phenyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C22H22FN2O4+
    ethyl (1R,3R,3aS,6aS)-1-(2-fluorophenyl)-3-methyl-4,6-dioxo-5-phenyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— ethyl (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 —— C22H22FN2O4+
    ethyl (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
    —— ethyl (1R,3S,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,3S,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,3S,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,3S,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,3S,3aS,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,3S,3aS,6aS)-3,5-diethyl-1-(3-fluorophenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— Ethyl 2-[[2-[2-(2-oxo-1,3-benzoxazol-3-yl)acetyl]oxyacetyl]amino]benzoate —— C20H18N2O7
    Ethyl 2-[[2-[2-(2-oxo-1,3-benzoxazol-3-yl)acetyl]oxyacetyl]amino]benzoate
    —— ethyl (1R,3S,3aS,6aS)-3-butyl-5-ethyl-1-(2-methoxyphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C22H30N2O5
    ethyl (1R,3S,3aS,6aS)-3-butyl-5-ethyl-1-(2-methoxyphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— ethyl (1R,3R,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,3R,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 (1S,3R,3aS,6aS)-1-(4-chlorophenyl)-5-ethyl-3-(2-methylsulfanylethyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C20H25ClN2O4S
    ethyl (1S,3R,3aS,6aS)-1-(4-chlorophenyl)-5-ethyl-3-(2-methylsulfanylethyl)-4,6-dioxo-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]pyrrol-2-ium-3-carboxylate —— C22H22FN2O4+
    ethyl (1R,3S,3aS,6aS)-1-(2-fluorophenyl)-3-methyl-4,6-dioxo-5-phenyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— ethyl (1R,3R,3aS,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,3aS,6aS)-3-methyl-1-(4-methylphenyl)-4,6-dioxo-5-phenyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— ethyl (1R,3R,3aS,6aS)-5-ethyl-1-(4-methoxyphenyl)-3-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C19H25N2O5+
    ethyl (1R,3R,3aS,6aS)-5-ethyl-1-(4-methoxyphenyl)-3-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate
    —— ethyl (1S,3S,3aS,6aS)-1-(2,5-dimethoxyphenyl)-5-ethyl-3-(hydroxymethyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C20H26N2O7
    ethyl (1S,3S,3aS,6aS)-1-(2,5-dimethoxyphenyl)-5-ethyl-3-(hydroxymethyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— ethyl (1R,3S,3aS,6aS)-1-(2-fluorophenyl)-4,6-dioxo-5-phenyl-3-propyl-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C24H26FN2O4+
    ethyl (1R,3S,3aS,6aS)-1-(2-fluorophenyl)-4,6-dioxo-5-phenyl-3-propyl-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-[(4-hydroxyphenyl)methyl]-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate —— C22H24N2O6
    ethyl (1R,3R,3aS,6aS)-5-ethyl-1-(furan-2-yl)-3-[(4-hydroxyphenyl)methyl]-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylate
    —— ethyl (1R,3R,3aR,6aS)-3,5-diethyl-1-(4-hydroxyphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C19H25N2O5+
    ethyl (1R,3R,3aR,6aS)-3,5-diethyl-1-(4-hydroxyphenyl)-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-(furan-2-yl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C17H23N2O5+
    ethyl (1R,3S,3aS,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 (1S,3R,3aS,6aS)-5-ethyl-1-(4-fluorophenyl)-3-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate —— C18H22FN2O4+
    ethyl (1S,3R,3aS,6aS)-5-ethyl-1-(4-fluorophenyl)-3-methyl-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate