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5-Benzofurancarbonitrile, 2-[4-(4-nitrophenoxy)phenyl]-
CAS:90178-99-7
Formula:C21H12N2O4

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Cyclopenta[c]pyrrole-5-carbonitrile,
6-(1,3-benzodioxol-5-yl)-1,2-dihydro-4-hydroxy-1-oxo-3-phenyl-
CAS:469862-53-1
Formula:C21H12N2O4

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9H-Indeno[2,1-c]pyridazin-9-one,
3-(8-methoxy-2-oxo-2H-1-benzopyran-3-yl)-
CAS:875655-52-0
Formula:C21H12N2O4

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1H-Imidazolium, 1-[(3-oxo-1(3H)-isobenzofuranylidene)methyl]-,
1,3-dihydro-1,3-dioxo-2H-inden-2-ylide, (Z)-
CAS:137935-04-7
Formula:C21H12N2O4

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1H-Imidazolium, 1-(3-hydroxy-1-oxo-1H-inden-2-yl)-,
1,3-dihydro-1,3-dioxo-2H-inden-2-ylide
CAS:137935-05-8
Formula:C21H12N2O4

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1H-Imidazolium, 1-[(3-oxo-1(3H)-isobenzofuranylidene)methyl]-,
1,3-dihydro-1,3-dioxo-2H-inden-2-ylide, (E)-
CAS:137935-08-1
Formula:C21H12N2O4

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1H-Isoindole-1,3(2H)-dione, 2-(2-naphth[1,2-d]oxazol-2-yl-2-oxoethyl)-
CAS:74101-00-1
Formula:C21H12N2O4