Purine and pyrimidine antagonists.
D000963:Antimetabolites; D011687:Purines / Q000037:antagonists & inhibitors*; D011743:Pyrimidines / Q000037:antagonists & inhibitors*
D000963:Antimetabolites; D011687:Purines; D011743:Pyrimidines; C030986:pyrimidine; C030985:purine
PURINES/antagonists; PYRIMIDINES/antagonists