Tetramethylolacetylenediurea5395-50-6100 % similar Cucurbituril80262-44-857 % similar Mx 27017464-88-944 % similar Diazolidinyl urea78491-02-836 % similar Dmdm hydantoin6440-58-032 % similar N-(Hydroxymethyl)-2-pyrrolidone15438-71-830 % similar N-(Hydroxymethyl)-3,4,5,6-tetrahydrophthalimide4887-42-730 % similar