N,N′-Bis(1-methylethyl)thiourea2986-17-6100 % similar 4-Isopropylthiosemicarbazide13431-36-256 % similar 1,1-Dimethylethyl N,N′-bis(1-methylethyl)carbamimidate71432-55-842 % similar N-(1-Methylethyl)thiourea1719-76-241 % similar Dicyclohexylthiourea1212-29-932 % similar