Fumaric acid, malonic acid, glutaric acid, ethylene brassylate, and a broad range of other acyclic polycarboxylic acids and their derivatives fall into this residual heading when they are not specifically enumerated elsewhere in Chapter 29. The US schedule is unusually granular here, with fifteen 10-digit lines distinguishing aromatic-derived variants, plasticizer subsets, and specific named compounds such as ferrous fumarate (2917191000) and malonic acid (2917193500). China is the leading supplier, followed by Canada and India, and imports from China across multiple lines in this heading are subject to Section 301 tariffs. Correct classification requires careful attention to whether the compound is aromatic-derived and whether it falls within a US schedule note.

AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.