2918.30.90.00 - Other

This HTS category, 2918.30.90.00, encompasses a residual group of carboxylic acids that possess an aldehyde or ketone functional group, but crucially, do not have any other oxygen-containing functional groups present. This classification applies to such compounds and their respective anhydrides, halides, peroxides, and peroxyacids, as well as their halogenated, sulfonated, nitrated, or nitrosated derivatives. The defining characteristic is the combination of a carboxylic acid moiety with an aldehyde or ketone, excluding more complex structures with additional oxygen functionalities like hydroxyls or ethers.

This category serves as a catch-all for substances that meet the broad criteria of Section VI, Chapter 29, specifically within the sub-heading for carboxylic acids with aldehyde or ketone functions, but do not precisely align with the more specific sibling categories. For instance, it differs from 2918.30.70.00, which explicitly names specific esters of oxalacetic and trifluoro-oxobutanoic acids. Therefore, 2918.30.90.00 is designated for other compounds that fit the general description but are not individually enumerated elsewhere at this level.

As this is a leaf node in the HTS classification system, there are no further subcategories under 2918.30.90.00. Classification decisions for goods falling under this code will therefore rely on a careful analysis of the compound's chemical structure to confirm it meets the criteria of possessing a carboxylic acid group alongside an aldehyde or ketone group, without any other oxygen functions, and is not specifically listed under preceding HTS codes.