Ferric sodium oxylate (CAS 555-34-0)
The subject product is a chemical product called
Ferric Sodium Oxylate.
It is also know as trisodium
trioxalatoferrate.
It will be used in metal treating.
Subheading HS: 2917.11.
Source: https://rulings.cbp.gov/index.asp, June 12, 2017 (N286981)