Acetic anhydride (291524) is a DEA List II chemical because of its use in heroin synthesis. Importers must register with the DEA, file import declarations, and comply with quota and recordkeeping requirements. CBP coordinates with DEA on these shipments, and failure to comply can result in seizure and civil or criminal penalties.

Heading 2915 captures these fatty acids in their chemically isolated, purified form as industrial organic chemicals. Crude or refined fats and oils in their natural triglyceride form belong in the fats and oils chapters. Once the fatty acid is separated and presented as a pure or technical-grade acid, it falls under 291570 in this heading.