Other Name: 4,4'-Oxybis(Benzenesulfonyl Chloride); P,Pâ??-Oxybis(Benzenesulfonyl Chloride); 4,4â??-Bis(Chlorosulfonyl)Diphenyl Ether; OBSC CAS NO.: 121-63-1 Molecular Formula : C12H8Cl2O5S2   Product Usage: This product can be used in organic synthesis, pharmaceutical, also is a plasticizer. It Is agent intermediates of OBSH foaming.   Check-Point Unit Specifications Appearance --- White Crystal Powder White Crystal Powder Purity % min 98 85 Melting Point °C min 127 126 Free Water % max 0.3 15 Free Acid % max 0.2 0.5