5-Sulfosalicylic Acid
5-Sulfosalicylic acid (5-hydroxy-2-sulfobenzoic acid) is listed in HTS 2918.29.04.00 despite sulfonation, as a specific exception for phenolic carboxylic acids. Widely used for protein precipitation and iron testing in labs.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If sulfonation dominates over phenolic function
Sulfonated derivatives without specific naming fall under general sulfonated carboxylic acids.
If organo-sulfur classification emphasized
Chapter 29 note excludes sulfonated from 2930 only if not phenolic carboxylic priority.
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Import Tips & Compliance
• Declare sulfonic acid position and content; ensure solution not for specific use per note (e); common pitfall is classifying as general sulfonated in 2918.19
Related Products under HTS 2918.29.04.00
2,3-Cresotic Acid
2,3-Cresotic acid is a carboxylic acid with phenol function, specifically 2,3-dihydroxy-4-methylbenzoic acid, classified under HTS 2918.29.04.00 as one of the specifically named 'other' carboxylic acids with phenol function but without other oxygen function. It is used in organic synthesis and pharmaceutical intermediates.
2-Hydroxybenzoic Acid Calcium Salt
2-Hydroxybenzoic acid calcium salt, also known as calcium salicylate, is the calcium salt of salicylic acid listed explicitly in HTS 2918.29.04.00. It falls under carboxylic acids with phenol function and is used in pharmaceuticals, lubricants, and as a corrosion inhibitor.
1-Hydroxy-2-Naphthoic Acid
1-Hydroxy-2-naphthoic acid is a naphthol carboxylic acid explicitly named in HTS 2918.29.04.00, featuring both phenol and carboxylic functions without other oxygen groups. It serves as an intermediate in dyes, pharmaceuticals, and agrochemicals.
2-Hydroxy-1-Naphthoic Acid
2-Hydroxy-1-naphthoic acid, a phenolic naphthoic acid, is specifically listed under HTS 2918.29.04.00 for carboxylic acids with phenol function. Commonly used in azo dye coupling and pharmaceutical synthesis.
1-Hydroxy-2-Naphthoic Acid Phenyl Ester
1-Hydroxy-2-naphthoic acid phenyl ester is the phenyl ester derivative explicitly covered by HTS 2918.29.04.00, classified with its parent acid per Chapter 29 ester rules. It is utilized in fine chemical synthesis and as a dye intermediate.
α-Resorcylic Acid
α-Resorcylic acid (2,4-dihydroxybenzoic acid) is a dihydroxybenzoic acid named in HTS 2918.29.04.00 under phenolic carboxylic acids without other oxygen functions. It finds use in pharmaceuticals and as a biochemical reagent.