Ureidopropyltrimethoxysilane23843-64-335 % similar Acetone semicarbazone110-20-333 % similar Ureidopropyltriethoxysilane23779-32-033 % similar Allantoic acid99-16-133 % similar Citrulline372-75-832 % similar Citrulline627-77-032 % similar Phenylurea64-10-832 % similar Homocitrulline1190-49-431 % similar 2-Hydroxyacetamide598-42-530 % similar Carbamoyl aspartic acid923-37-530 % similar 1-Phenylsemicarbazide103-03-730 % similar