What do you make of their language in the PR regarding "optimizing [ACH-2684's] interaction against NS3 protease"? Doesn't that suggest that this compound is another type of protease inhibitor or otherwise some take on a protease inhibitor? Given that the focus of this compound and program appears to be on resistance, and PIs are the HCV class most likely prone to resistance, perhaps the goal of this program is to build a better PI that's less prone to resistance.