3,6-Dihydroxy-2,7-naphthalenedisulfonic acid from Mexico
A naphthalene-based compound with two hydroxy groups and two sulfo groups, explicitly named in HTS 2908.99.0300 as a sulfonated derivative of phenols or phenol-alcohols containing only sulfo groups. This chemically defined organic compound serves as a key intermediate for azo dye production. Its classification follows chapter note prioritizing last numerical heading for multi-function compounds.
Duty Rate — Mexico → United States
Rate breakdown
Import Tips
• Submit NMR or HPLC analysis verifying the exact isomer structure, as chapter note (b) excludes certain isomer mixtures
• Confirm absence of halogen or nitro groups through testing to maintain classification in the 'sulfo groups only' subheading
• Declare CAS number (specifically 581-86-2) and molecular formula on commercial invoice for accurate HTS verification