1,1'-(2,3,5,6-Tetramethyl-p-phenylene)bis(3-(2-chloroethyl)-3-nitrosourea) 13907-60-3 BRN 2925556 NSC 93171 Urea, 1,1'-(2,3,5,6-tetramethyl-p-phenylene)bis(3-(2-chloroethyl)-3-nitroso-