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. 2013 Apr 29;18(5):5005–5031. doi: 10.3390/molecules18055005

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© 2013 by the authors; licensee MDPI, 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) Chemical structures of [¹⁸F]FBA-γ-folate [63], (B) [¹⁸F]fluoro-benzene-carbohydrazide-folates, (C) [¹⁸F]fluoro-pyridine-carbohydrazide-folate [63], (D) [¹⁸F]fluoro-pyridine-carbohydrazide-methotrexate [67] and (E) [¹⁸F]fluoro-pyridine-carbohydrazide-methotrexate [67].