正丹股份：公司从事高端环保新材料和特种精细化学品的研发、生产和销售

Group 1 - The company focuses on the aromatic comprehensive utilization industry chain, engaging in the research, production, and sales of high-end environmentally friendly new materials and specialty fine chemicals [1] - Main products include Trimellitic Anhydride (TMA), Trioctyl Trimellitate (TOTM), Vinyl Toluene (VT), and Pseudocumene [1]