3S7A:
reference: Structural analysis of human dihydrofolate reductase as a binary complex with the potent and selective inhibitor 2,4-diamino-6-{2'-O-(3-carboxypropyl)oxydibenz[b,f]-azepin-5-yl}methylpter idine reveals an unusual binding mode., Cody V, Pace J, Nowak J, Acta Crystallogr D Biol Crystallogr. 2011 Oct;67(Pt 10):875-80. Epub 2011, Sep 8. PMID: 21931219

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