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Allantoin97-59-6100 % similar 5-Isopropylhydantoin16935-34-538 % similar Allantoic acid99-16-136 % similar 5-(4-Hydroxyphenyl)imidazolidine-2,4-dione2420-17-936 % similar 5-(4-Hydroxyphenyl)-2,4-imidazolidinedione54832-24-536 % similar 5-Hydantoinacetic acid5427-26-934 % similar Phenylhydantoin89-24-734 % similar 5-(2-(Methylthio)ethyl)-2,4-imidazolidinedione13253-44-633 % similar Cyclohexylurea698-90-832 % similar Biuret108-19-032 % similar Biurea110-21-432 % similar 5-(Phenylmethyl)-2,4-imidazolidinedione3530-82-332 % similar Aminourea hydrochloride563-41-730 % similar Hydroxyurea127-07-130 % similar