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S.M.S. Chauhan and Pratibha Kumari
Tetrahedron 2009, Vol. 65, Iss. 12, P. 2518-2524
Synthesis of unsymmetrical benzoporphyrazines in functional ionic liquids and formation of self-aggregates of zinc(II) pyridino[3,4]tribenzoporphyrazines in solution
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http://dx.doi.org/10.1016/j.tet.2009.01.046