58845-59-3 ICIG 1164 N-(2-Chloroethyl)-N-nitroso-N'-(2,3,4-tri-O-acetyl-beta-D-xylopyranosyl)urea NSC 245431 Urea, N-(2-chloroethyl)-N-nitroso-N'-(2,3,4-tri-O-acetyl-beta-D-xylopyranosyl)- X-Pcnu