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tBuY^"X

Fig. 2.11 Recent acyclic tripeptide inhibitors.

shows moderate replicon potency (EC50 = 400 nM), good oral bioavaila-bility and excellent liver exposure [145]. The replicon system was also used to obtain resistance mutations for this compound. The amino acid substitutions A156S [91] or A156T [146] significantly weaken binding. Interestingly, A156S does not significantly affect the binding of the tripeptide BILN

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