2ANO:
reference: A 2.13 A Structure of E. coli Dihydrofolate Reductase Bound to a Novel Competitive Inhibitor Reveals a New Binding Surface Involving the M20 Loop Region., Summerfield RL, Daigle DM, Mayer S, Mallik D, Hughes DW, Jackson SG, Sulek M, Organ MG, Brown ED, Junop MS, J Med Chem. 2006 Nov 30;49(24):6977-6986. PMID: 17125251

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