This standard specifies the requirements, sampling, test methods, inspection rules, signs, labels, packaging, transportation and storage of red base B (2-methoxy-4-nitroaniline, CI Azoic Diazo Component 5) products. This standard applies to product quality control of red base B. Structural formula: Molecular formula: CHNO Relative molecular mass: 168.15 (according to the 2007 international relative atomic mass) CAS RN: 97-52-9