1-(2-Chloroethyl)-3-(2a,3,4,5-tetrahydroacenaphthen-6-yl)urea 1-(2-Chloroethyl)-3-(6,7,8,8a-tetrahydro-acenaphthen-5-yl)urea 102433-67-0 Urea, 1-(2-chloroethyl)-3-(6,7,8,8a-tetrahydro-acenaphthen-5-yl)-