CAS: 5965-83-3 EC No: 202-555-6 MDL No: MFCD00007508 RTECS: VO6500000 UN No: UN2585; Haz Class: 8; Packing Group: III Crystalline Molecular Formula: C₇H₆O₆S·2H₂O MW: 254.21 Melting Point: 105-110°