The CS-023 concentration in plasma after administration by infusion to healthy volunteers at a dose of 700 mg was decreased, with a half-life of 1.7 h, and the cumulative urinary excretion was 59.4% of the dose. The total clearance, renal clearance, and volume of distribution were 8.12 liters/h, 4.14 liters/h, and 17.2 liters, respectively.