1,4-(Bis-glutathion-S-yl)-1,2,3,4-tetrachloro-1,3-butadiene 115664-52-3 BCTB Glycine, 2,2'-(1,2,3,4-tetrachloro-1,3-butadiene-1,4-diyl)bis(L-gamma-glutamyl-L-cysteinyl-