... name for 2 - amino - 6 methyl - 4 - normal propyl - 4, 5 - dihydro - [1,2,4] triazole - [1, 5) and pyrimidine - 5 - ketone for BaiSeJing form solid ... phosphodiesterase IV inhibitor soluble in dimethylformamide, dichloromethane, methanol slightly soluble in ethyl acetate, ethylene dichloride, toluene insoluble in petroleum ether water solubility 2 ...