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5-Pyrimidinecarboxylic acid,
1-(2,2-diethoxyethyl)-2-(3,5-dinitrophenyl)-1,6-dihydro-6-oxo-, ethyl
ester
CAS:184711-15-7
Formula:C19H22N4O9

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Cytidine, 2'-O-methyl-N-[[2-(4-nitrophenyl)ethoxy]carbonyl]-
CAS:185761-12-0
Formula:C19H22N4O9

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Cytidine, 3'-O-methyl-N-[[2-(4-nitrophenyl)ethoxy]carbonyl]-
CAS:185761-13-1
Formula:C19H22N4O9

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(2S)-{[(2S)-2-amino-3-(4-hydroxyphenyl)propanoyl]amino}[(3S,4R,5R)-5-(2,4-dioxo-3,4-dihydropyrimidin-1(2H)-yl)-3,4-dihydroxytetrahydrofuran-2-yl]ethanoic acid (non-preferred name)
CAS:86632-66-8
Formula:C19H22N4O9

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7-methyl-2-pyrrolidin-1-yl-5,7-dihydro-6H-pyrrolo[2,3-d]pyrimidin-6-one di[(2E)-but-2-enedioate]
CAS:122113-43-3
Formula:C19H22N4O9

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2,4,6-trinitrophenol - 1-(2,6-dimethoxybenzyl)pyrrolidine (1:1)
CAS:58395-75-8
Formula:C19H22N4O9