“Intravenous pretreatment of animals with sodium thiosulfate was observed to prevent the toxic effects of N, N'-ethylene-bis\[5-(2-bromoethylthio) valeramide\] ( I ; half-life, approximately four seconds), but not N,N'-ethylene-bis\[(2-chloroethylthio) acetamide\] (II; halflife, 15 minutes).”