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. 2012 Oct 8;13(10):12857–12879. doi: 10.3390/ijms131012857

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© 2012 by the authors; licensee Molecular Diversity Preservation International, Basel, Switzerland.

This article is an open-access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0).

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(a) Adenine component of cAMP; (b) Purine-like hits; (c) 4-[3-(methoyxphenyl)amino]-6-(methylsulfonyl)quinoline-3-carboxamide; (d) quinoline-like hits. Analogous nitrogen atoms are highlighted in blue.