%0 Conference Proceedings %T Synthesis of new pyrimido[4,5-d]pyrimidin-4(1H)-one derivatives in the presence of ferric hydrogensulfate %A Javadian Saraf, Aida %A Eshghi, Hossein %A Rahimizadeh, Mohammad %A Hasanpour Mansour, Maede %J 20th Iranian Seminar of Organic Chemistry %D 2013