ChemInform Abstract: An Efficient One‐Pot Four‐Component Synthesis of 5H‐Spiro[benzo[7, 8]chromeno [2, 3‐c]pyrazole‐7, 3′‐indoline]‐2′, 5, 6(9H)‐trione Derivatives Catalyzed by MgCl2. Issue 26 (June 2015) - Shen, Tianhua; Fu, Zhijie; Che, Fengfeng; Dang, Haibo; Lin, Yan; Song, Qingbao