A series of novel tetracyclic core-containing HCVNS5Ainhibitors has been discovered. Incorporation of tetrahydropyran-substituted amino acid moiety improved their potency and yielded HCVNS5Ainhibitors with a minimum potency shift from the GT1a strain compared to other genotypes and mutants. Compounds 53 and 54 showed the best potency profile and had reasonable half-times in rat PK studies. However