(1,1'-Biphenyl)-4,4'-disulfonyl dichloride 3406-84-6 4,4'-Biphenyldisulfonyl chloride (8CI) 4,4'-Biphenylylenedisulfonyl chloride 4,4'-Bis(phenylsulphonyl) dichloride EINECS 222-293-6 NSC 2062 p,p'-Diphenyldisulfonyl chloride