title: Separation by gas-liquid chromatography of mono- and symmetrically disubstituted ureas as their trifluoroacetates.
mesh_terms: D002849:Chromatography, Gas; D005463:Fluoroacetates / Q000302:isolation & purification*; D008722:Methods; D014508:Urea / Q000302:isolation & purification*
chemical_list: D005463:Fluoroacetates; D014508:Urea