- Structure determination of tetrahydroquinazoline antifolates in complex with human and Pneumocystis carinii dihydrofolate reductase: correlations between enzyme selectivity and stereochemistry. Cody, V., Luft, J.R., Pangborn, W., Gangjee, A., Queener, S.F. Acta Crystallogr. D Biol. Crystallogr. (2004)