1,1-Diethyl-2-selenourea 4-04-00-00400 (Beilstein Handbook Reference) 5117-17-9 BRN 1747733 EINECS 225-855-9 N,N-Diethylselenourea Selenourea, N,N-diethyl- UREA, 1,1-DIETHYL-2-SELENO- USAF B-100