1-(Methylsulfonyl)-2-imidazolidinone41730-79-4100 % similar 1-Acetyl-2-imidazolidinone5391-39-942 % similar 2-Oxo-1-imidazolidinecarbonyl chloride13214-53-438 % similar 1-(2-Hydroxyethyl)-2-imidazolidinone3699-54-537 % similar 1-(2-Aminoethyl)-2-imidazolidinone6281-42-136 % similar 3-(Methylsulfonyl)-2-oxo-1-imidazolidinecarbonyl chloride41762-76-934 % similar Carmustine154-93-832 % similar 1-Methanesulfonyl-piperazine55276-43-231 % similar (αS)-Tetrahydro-α-(1-methylethyl)-2-oxo-1(2H)-pyrimidineacetic acid192725-50-131 % similar