Furanose Sugar Derivative from Japan
Methyl furanoside derivatives feature five-membered oxygen heterocyclic rings from sugar cyclization, used as glycosyl donors in carbohydrate synthesis. Excluded from sugar headings by Chapter 29 priority, classified 2932.99.90.90. Qualifies as chemically defined heterocyclic oxygen compound.
Duty Rate — Japan → United States
12.5%
Rate breakdown
9903.05.4912.5%Section 301 (forced labor) — Japan (col1 rate < 12.5 percent): MFN < 12.5% → total duty capped at 12.5%
Import Tips
• NMR spectra confirming furanose anomeric configuration required
• Reducing sugar test negative prevents classification under Chapter 17
• Protecting group analysis essential for multi-step synthesis intermediates