Structure-activity relations in two new series of antifolic acids.
D005493:Folic Acid Antagonists; D011687:Purines / Q000494:pharmacology*; D011743:Pyrimidines / Q000494:pharmacology*
D005493:Folic Acid Antagonists; D011687:Purines; D011743:Pyrimidines; C030985:purine
FOLIC ACID ANTAGONISTS; PURINES/effects; PYRIMIDINES/effects