Activity of a novel 1,3-beta-D-glucan Synthase Inhibitor, Ibrexafungerp (formerly SCY-078), Against Candida glabrata

Ibrexafungerp (formerly SCY-078), a novel glucan synthase inhibitor with oral availability, was evaluated for activity against Susceptibility of clinical strains to Ibrexafungerp was determined by microdilution and time kill assays. The MIC range against wild type strains was 1-2 μg/mL. IBX was also active against the majority of echinocandin-resistant strains. Time kill studies showed a 4 to 6-log reduction in growth at concentrations of 0.25 to 4 μg/ml at 24 and 48 hr.