Benzopurpurin 4BBenzopurpurin 4B CAS: 992 59 6 MF: C34H26N6Na2O6S2 MW: 724. 73 Buy now for reliable and Reproducible results from TriStains at Chemical World. Benzopurpurin 4B is a red azo stain that is provided as a powder and is typically used as a biological stain and pH indicator in the acidic pH of 2. 3 4. 4. It is a compound with a molecular formula of C34H26N6Na2O6S2 and also known as Acid Violet 49, C. I. Acid Violet 49, or Acid Violet N. It is water soluble

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