一心堂：一心便利是公司全资子公司，专注于便利店业务

Group 1 - The core viewpoint of the article is that Yixin Tang is leveraging its subsidiary Yixin Convenience to enhance its business model by integrating health and convenience store operations [2] Group 2 - Yixin Convenience is a wholly-owned subsidiary of Yixin Tang, focusing on the convenience store business [2] - The company aims to create a synergistic effect between its convenience stores and pharmacies through a "health + convenience" model [2]