Synonyms: o-Nitrophenylacetic acid Purity Limit: ≥ 99% (HPLC) CAS No.: 3740-52-1 Molecular Formula: C8H7NO4 Molecular Weight: 181.1 MDL No.: MFCD00007190 Appearance: Off-white crystalline powder Melting Point: 137-144 °C Storage Temperature: Store at RT Warnings: Irritant!