sulphophthalic acid is a chemical compound registered under CAS number 26657-75-0, with the molecular formula C8H6O7S and a molecular weight of about 246.19 g/mol. Its EINECS (EC) number is 247-885-1. It is also known as 3-sulfobenzene-1,2-dicarboxylic acid. NewsChem supplies sulphophthalic acid for laboratory research and bulk production; product code 1268884. Send an inquiry for purity, packaging, price and lead time.