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| | Zhang, Jiangli, Li, Wei Lin and Wu, Li Qiang Zr(HSO4)4 as an efficient catalyst for the preparation of 10-aryl-6,8-dimethyl-6,10dihydro-5-oxa-6,8-diazaanthra[2,3-d][1,3]dioxole-7,9-diones under solvent-free conditions. J. Braz. Chem. Soc., July 2011, vol.22, no.7, p.1236-1240. ISSN 0103-5053
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