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2,4-Dinitrocinnamic acid [3-(2,4-dinitrophenyl)prop-2-enoic acid], C
9H
6N
2O
6, crystallizes as a normal centrosymmetrical carboxy dimer. O-H

O and C-H

O hydrogen bonds are found in the structure.
Supporting information
 | Crystallographic Information File (CIF) Contains datablocks global, 24dn |
 | Structure factor file (SHELXL table format) Supplementary material |
CCDC reference: 128421

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