1,3-Dimethyl-2-thiourea 1,3-Dimethylisothiourea 1,3-Dimethylthiourea 534-13-4 Dimethylthiocarbamide N,N'-Dimethylthiourea NSC8727 Thiourea, N,N'-dimethyl- Urea, 1,3-dimethyl-2-thio- sym-Dimethylthiourea