Crystal structure of dihydrofolate reductase (DHFR) from the filarial nematode W. bancrofti in complex with NADPH and [2-({4-[(2-amino-4-oxo-4,7-dihydro-3H-pyrrolo[2,3-d]pyrimidin-5-yl)methyl]benzene-1-carbonyl}amino)-4-cyanophenyl]acetic acid (TSD25 or OFD)
