Nitric oxide synthase inhibitors derived from cyclic amidines

摘要

Compounds having formula (I) wherein R<1>, R<5>, R<6> and R<7> are hydrogen or certain specified substituents; R<8> and R<9> are independently hydrogen, hydroxy or alkoxy; and X, A and B are independently NR<2>, O, S, SO, SO2, CH=CH or (CH2)p, p being 0-6; are useful as nitric oxide synthase inhibitors.