... methyl - 4 - normal propyl - 4, 5 - dihydro - [1,2,4] triazole - [1, 5) and pyrimidine - 5 - ketone for BaiSeJing form solid molecular ... - propyl - 4 h - [1,2,4] triazolo [1, 5 - a] pyrimidin - 5 - one vomit; Nauseant phosphodiesterase IV inhibitor soluble in dimethylformamide ... soluble in ethyl acetate, ethylene dichloride, toluene insoluble in petroleum ether water solubility 2 g/L chloroform 83 g/L ...