List of Articles Phthalazine derivatives Open Access Article Abstract Page Full-Text 1 - 1,4-Disulfopiperazine-1,4-diium chloride ([Piper-(SO3H)2].2Cl) as an efficient ionic catalyst for synthesis of phthalazine derivatives Farhad Shirini Tahereh Ghauri Koodehi Omid Goli-Jolodar