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Heterocyces. Volume 31, Issue 11 ( November, 1, 1990 ), Pages 1967-1974
Pyridazine Derivatives, IX. Synthesis of 2H-Pyridazin-3-ones with Aroylpiperazinyl Groups
Enrique Ravina,* Carmen Teran, Lourdes Santana, Neftali Garcia, and Isabel Estevez
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http://www.heterocycles.jp/pfiles/pdf.php?article=4340