This will be an open-label, single-center study to evaluate pharmacokinetics and safety of HMPL-013 in approximately 6 healthy male subjects receiving a single oral 5mg dose of HMPL-013 containing approximately 100 microcuries of [14C] HMPL-013. This study will investigate the absorption, drug biotransformation and mass balance of HMPL-013, seek to identify the compound's major metabolites and supply information for clinical application.