Homophthalic Acid Stellar 2001 appears to refer to a specific grade or branded version of homophthalic acid, a dicarboxylic acid with applications in organic synthesis, polymer production, and pharmaceuticals. However, there is limited publicly available information on a product explicitly named "Stellar 2001." https://www.sarex.com/fine/product/key-products/homophthalic-acid-stellar-2001