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Figure 15
Different structures based on 3,4-di­amino­benzoic acid: (a) neutral C7H8N2O2 mol­ecule as found in DONDUH; (b) zwitterion in VODWIU; (c) quinoid resonance form of the C7H9N2O2+ cation in the title compounds (see text and compare scheme 1); (d) C7H7N2O2 anion as found in the metal complexes noted in the text.

ISSN: 2056-9890
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