This invention relates to: a) compounds and salts thereof that, inter alia, inhibit HCV; (b) intermediates useful for the preparation of such compounds and salts; (c) composition comprising such compounds and salts; (d) methods for preparing such intermediates, compounds, salts, and composition; (e) method of use of such compounds, salts, and compositions; and (f) kits comprising such compounds, salts, and composition.