... molecular mass 207.2 CA registration number 27277 - - 5 vapor pressure is 4.0 x 10-3 pa 25 °C melting point ... - 4 - propyl - 4 h - [1,2,4] triazolo [1, 5 - a] pyrimidin - 5 - one vomit; Nauseant phosphodiesterase IV inhibitor soluble in dimethylformamide, dichloromethane ... -6-methyl-4-propyl-4H-[1,2,4] triazolo [1,5-a]pyrimidin-5-one vomit; nauseant phosphodiesterase IV inhibitor 27277-00 ...