Core Viewpoint - The company, Yishitong (688733.SH), has stated that it currently does not have a direct business relationship with Changxin Storage, positioning itself as a supplier of functional materials in the chip packaging sector [1] Group 1: Company Information - Yishitong serves as an upstream supplier of functional materials, specifically in the chip packaging materials field [1] - The company's direct clients in this sector include manufacturers of EMC (epoxy molding compound), GMC (granular epoxy molding compound), LMC (liquid epoxy molding compound), and Underfill (underfill materials) [1]

Group 1 - The core viewpoint of the article is that 壹石通 (688733.SH) has not established a direct business relationship with Changxin Storage [1] - The company operates as an upstream supplier of functional materials, specifically in the chip packaging materials sector [1] - The direct customers of the company include manufacturers of EMC (epoxy molding compound), GMC (granular epoxy molding compound), LMC (liquid epoxy molding compound), and Underfill materials [1]