Sulfasalazine USP32(main product) Appearance Bright yellow or brownish-yellow odourless fine powder,soluble in alcohol,very slightly Identification Conform With monograph A.B Molecular weight 398.39 Solubility Soluble in alcohol,very slightly soluble in water Related substances Maximum single impurity NMT2.0% All impurity NMT4.0% Chlorides NMT 0.014% Sulfate NMT 0.04% Heavy metals NMT 0.002% Loss on drying NMT 1.0% Sulphated ash NMT 0.5% Assay 97.0—101.5%