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Article The Behaviour of Ethyl 1-acetyl-4-aryl-5-cyano-3-methyI-1,4-dihydropyrano[2,3-c]pyrazol-6-ylimidoformate Towards Nucleophiles was published on February 1, 2004 in the journal Heterocyclic Communications (volume 10, issue 1).
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Zaki et al. (2004) studied this question.
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