2918.30.10.00 - 1-Formylphenylacetic acid, methyl ester

This HTS classification covers specific aromatic carboxylic acids that possess an aldehyde or ketone functional group, in addition to their carboxylic acid function, and lack any other oxygen-containing functional groups. These compounds are typically esters of phenylacetic acid derivatives, where a formyl group is attached to the phenyl ring. The classification is limited to these particular structures and their derivatives, such as salts or simpler esters.

Within this level, 2918.30.10.00 is specifically for "1-Formylphenylacetic acid, methyl ester." This distinguishes it from its sibling, 2918.30.15.00, which covers "2-Chloro-4,5-difluoro-ß-oxobenzenepropanoic acid, ethyl ester; and Ethyl 2-keto-4-phenylbutanoate." The latter sibling includes compounds with different substituents on the aromatic ring and/or a different chain length or structure for the phenylalkanoic acid moiety, as well as different ester groups. The "Other" sibling category would encompass any aromatic carboxylic acids with aldehyde or ketone functions not specifically listed elsewhere in subheading 2918.30.

As this node is a leaf node within the HTS, there are no further subcategories to introduce. Therefore, the classification is definitive for the specified "1-Formylphenylacetic acid, methyl ester." Further subdivision within this code is not provided, meaning that any variations in purity or specific trade names of this exact chemical structure would fall under this single HTS code, subject to general import regulations.