1,3-Dimethyl-2-imidazolidinone CAS 80-73-9, etiam notus dimethyl ethylene ureae, ad 1,3-dimethyl-2-imidazolidinone, est polaris solvens summo fervens puncto, puncto excelso mico, humilis. punctum liquescens, toxicitas nimis humilis, pollutio valde gravis et solubilitas fortis, firmitatem validam, acidum validum, resistentia alcali fortis, resistentia aquae, resistentia levis, resistentia oxygeni.
3,6-Dichloropyridazinum CAS 141-30-0 obtinetur per dilatationem anuli et chlorinationem anhydridi maleitici.