... produces the product for 10 years, and have a patent, and the content is the highest, ... form solid molecular formula for C9H13N5O relative molecular mass 207.2 CA registration number 27277 - - 5 vapor ... 4 h - [1,2,4] triazolo [1, 5 - a] pyrimidin - 5 - one vomit; Nauseant phosphodiesterase IV inhibitor soluble in ... -4H-[1,2,4] triazolo [1,5-a]pyrimidin-5-one vomit; nauseant phosphodiesterase IV inhibitor ...