Khan, Khalid Mohammed; Ahmed, Sumbul; Hussain, Sajjad; Ambreen, Nida; Perveen, Shahnaz; Choudhary, M. Iqbal
Letters in Drug Design and Discovery, 2010 , vol. 7, # 4 p. 265 - 268
1.1: sulfuric acid / water / 2.5 h / 160 °C
1.2: 2.5 h / 190 °C
2.1: potassium hydroxide / water / 16 h / Reflux
3.1: sulfuric acid / 16 h / Reflux
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