Figure 4.
Intramolecular hydrogen bond stabilization of a molecule and its radical: (a)—2,3-dihydroxybenzoic acid (1); (b)—3,4,5-trihydroxybenzoic acid (4); (c)—2,5-dihydroxybenzoic acid (3); (d)—3,4-dihydroxybenzoic acid (10).
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