List of Articles 4-Dihydropyrimidin-2(1H)-thiones Open Access Article Abstract Page Full-Text 1 - Nano-Silica phosphoric acid: an efficient catalyst for one-pot synthesis of 3,4-dihydropyrimidin-2(1H)-ones (thiones) under solvent-free or sonication conditions Abdolhamid Bamoniri Bi Bi Fatemeh Mirjalili Sedigheh Nazemian