3NXR:
reference: Preferential selection of isomer binding from chiral mixtures: alternate binding modes observed for the E and Z isomers of a series of 5-substituted 2,4-diaminofuro[2,3-d]pyrimidines as ternary complexes with NADPH and human dihydrofolate reductase., Cody V, Piraino J, Pace J, Li W, Gangjee A, Acta Crystallogr D Biol Crystallogr. 2010 Dec;66(Pt 12):1271-7. Epub 2010, Nov 16. PMID: 21123866

This OCA Structure page
uses Jmol, developed by the Jmol Development Team (documentation).