... 4 - normal propyl - 4, 5 - dihydro - [1,2,4] triazole - [1, 5) and pyrimidine - 5 - ketone for BaiSeJing ... vapor pressure is 4.0 x 10-3 pa 25 °C melting point is 163-165 °C ... methyl - 4 - propyl - 4 h - [1,2,4] triazolo [1, 5 - a] pyrimidin - 5 - one vomit; Nauseant phosphodiesterase IV ... )(); 2-Amio-6-methyl-4-propyl-4H-[1,2,4] triazolo [1,5-a]pyrimidin-5-one vomit; nauseant phosphodiesterase IV ...