Heterocyclic compounds for enhancing antitumor activity

摘要

PCT No. PCT/US92/09554 Sec. 371 Date Aug. 17, 1994 Sec. 102(e) Date Aug. 17, 1994 PCT Filed Nov. 17, 1992 PCT Pub. No. WO93/17021 PCT Pub. Date Sep. 2, 19932,6-Diaminopurines, 3,5-diamino-6,7,8,9-tetrahydrobenzo[b]thiophene[2,3-d]pyrimidines and 2,4-diaminothieno[3,2-d]pyrimidines useful as inhibitors of P-glycoproteins and potentiators of chemotherapeutic agents.