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. 2013 Sep 24;3:249. doi: 10.3389/fonc.2013.00249

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Copyright © 2013 Müller and Schibli.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Folic acid and antifolates. Chemical structures of (A) folic acid and the antifolates (B) methotrexate, (C) raltitrexed (Tomudex™ ), and (D) pemetrexed (Alimta™ ).