British Pharmacopoeia Volume V
Appendices
Appendix I A. General Reagents

3-Nitrosalicylic Acid

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3-Nitrosalicylic Acid 2-Hydroxy-3-nitrobenzoic acid; C₇H₅NO₅ = 183.1 (85-38-1)

Yellowish crystals, slightly soluble in water, freely soluble in ethanol (96%).

Melting point, 142° to 147°.