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Hydroxybenzoic acid 
Summary
Hydroxybenzoic acid may refer to several related chemical compounds:
- 2-Hydroxybenzoic acid (salicylic acid, o-hydroxybenzoic acid)
- 3-Hydroxybenzoic acid (m-hydroxybenzoic acid)
- 4-Hydroxybenzoic acid (p-hydroxybenzoic acid)