N-(3-Hydroxy-4-nitrosophenyl)acetamide is an intermediate in the synthesis of 9-Amino-6,8-di-1,3,2-dithiarsolan-2-yl-5H-benzo[a]phenoxazin-5-one, which is a new environment-sensitive fluorescent probe designed for site-specific labeling of recombinant proteins in live cells. Molecular Formula: C8H8N2O3 Solubility: Dichloromethane Dimethylsulfoxide, Methanol Molecular Weight: 180.16