Abstract: This disclosure relates to medicines, and more particularly to a platelet aggregation inhibitor, a pharmaceutical composition containing the same and a preparation and application thereof. The platelet aggregation inhibitor provided herein is a compound of formula (I), or a pharmaceutically-acceptable salt, a tautomer or a pharmaceutically-acceptable solvate thereof. This application also provides an application of the compound of formula (I), or a pharmaceutically-acceptable salt, a tautomer, a pharmaceutically-acceptable solvate or a pharmaceutical composition thereof in the treatment of thrombus.