Thymidylate synthase inhibitors: the in vitro activity of a series of heterocyclic benzoyl ring modified 2-desamino-2-methyl-N10-substituted-5,8-dideazafolates. - Jackman AL; Marsham PR; Moran RG; Kimbell R; O'Connor BM; Hughes LR; Calvert AH (Advances in enzyme regulation, 1991)