U.S. Code / Title 19 — Customs Duties / Chapter 22—Uruguay Round Trade Agreements / Subchapter I—Approval of, and General Provisions…Title 19PartPart B—Tariff ModificationsContents§ 3521. Tariff modifications§ 3522. Liquidation or reliquidation and refund of duty paid on certain entries§ 3523. Duty free treatment for octadecyl isocyanate and 5-Chloro-2-(2,4-dichloro-phenoxy)phenol§ 3524. Consultation and layover requirements for, and effective date of, proclaimed actions