2-Naphthalenethiol from Mexico
2-Naphthalenethiol (C10H7SH) is a bicyclic aromatic thiol with sulfur directly linked to the naphthalene ring carbon. Falls under HTS 2930.90.2900 as 'Other' aromatic organo-sulfur compounds. Employed in materials science for self-assembled monolayers and as synthetic intermediate.
Duty Rate — Mexico → United States
110%
Rate breakdown
9903.04.6093.5%Except as provided in heading 9903.04.61, patented pharmaceutical articles as provided for in subdivisions (c) and (d) of U.S. note 40 to this subchapter
9903.05.5510%Except for products described in headings 9903.05.85–9903.05.92 and 9903.05.94, articles the product of Mexico, as provided for in U.S. note 52 to this subchapter
Import Tips
• HPLC purity certificate essential; impurities >2% may disqualify as 'chemically defined' per chapter notes
• Light-sensitive; specify storage conditions in import documentation to prevent degradation claims
• Confirm polycyclic aromatic structure vs simpler aromatics in earlier 2930 subheadings