9902.08.28 - Trisodium 5-oxo-1-(4-sulfonatophenyl)-4-[(E)-(4- sulfonatophenyl)diazenyl]-2,5-dihydro-1H-pyrazole-3- carboxylate (Acid Yellow 23) (CAS No. 1934-21-0) (provided for in subheading 3204.12.50)

This HTS provision, 9902.08.28, specifically covers Trisodium 5-oxo-1-(4-sulfonatophenyl)-4-[(E)-(4-sulfonatophenyl)diazenyl]-2,5-dihydro-1H-pyrazole-3-carboxylate, commonly known as Acid Yellow 23. This substance is a synthetic organic dyestuff, identified by CAS Number 1934-21-0. Its inclusion within Chapter 99 signifies it is subject to temporary legislation or special import restrictions under Section 22 of the Agricultural Adjustment Act, as amended, or proclaimed pursuant to trade agreements.

As this is a leaf node within Chapter 99, there are no further subdivisions. Its classification is highly specific, differentiating it from other dyestuffs or chemicals that might fall under broader headings in Section VI of the Harmonized Tariff Schedule, such as Chapter 32. The critical distinguishing factor here is its explicit listing under a temporary legislative provision, indicating that its import may be governed by specific quotas, duties, or restrictions beyond the standard tariff treatment outlined in other chapters. The parenthetical reference to subheading 3204.12.50 highlights its underlying nature as a colorant but emphasizes that its current import status is governed by the special provisions of Chapter 99.