3-[[2-[(methylaminosulfonyl)amino]-3-fluoropyridin-4-yl]methyl]-4-methyl-7-[(pyrimidin-2-yl)oxy]-2H-1-benzopyran-2-one
RO-5126766 free base is under investigation in clinical trial NCT03875820 (Phase I Trial of VS-6063 and RO5126766.).