Dithiothreitol (DTT) from Mexico
Dithiothreitol is a 1,4-dithiol compound (HOCH2(CHOH)2CH2SH)2 with two SH groups directly attached to carbon atoms. HTS 2930.90.92 covers this as other organo-sulfur compound used as reducing agent in biotech. Meets chapter definition for separate chemically defined compounds.
Duty Rate — Mexico → United States
13.7%
Rate breakdown
9903.05.5510%Section 301 (forced labor) — additional 10% ad valorem on products of Mexico
Import Tips
• Specify biotech/pharma end-use on entry documents to justify Chapter 29 classification
• Maintain cold chain documentation if shipped refrigerated per stability requirements
• Avoid bulk packaging that suggests industrial chemical use triggering different scrutiny