2-Amino-5,7-dimethoxy-1,2,4-triazolo[1,5-a]pyrimidine (ADTP) (CAS No. 13223–43–3) (provided for in subheading 2933.59.95) Free No change No change On or before 12/31/2020 . 543. Cyanuric chloride Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.06.50 Cyanuric chloride (2,4,6-trichloro-1,3,5-triazine) (CAS No. 108–77–0) (provided for in subheading 2933.69.60) Free No change No change On or before 12/31/2020 . 544. Metribuzin Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.06.51 4-Amino-6-tert-butyl-3-methylthio-1,2,4-triazin-5(4H)-one (Metribuzin) (CAS No. 21087–64–9) (provided for in subheading 2933.69.60) 1.9% No change No change On or before 12/31/2020 . 545. Hexazinone Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.06.52 3-Cyclohexyl-6-dimethylamino-1-methyl-1,3,5-triazine-2,4(1H,3H)-dione (Hexazinone) (CAS No. 51235–04–2) (provided for in subheading 2933.69.60) Free No change No change On or before 12/31/2020 . 546. Pymetrozine Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.06.53 6-Methyl-4-{[(1E)-pyridin-3-ylmethylene]amino}-4,5-dihydro-1,2,4-triazin-3(2H)-one (Pymetrozine) (CAS No. 123312–89–0) (provided for in subheading 2933.69.60) Free No change No change On or before 12/31/2020 . 547. Atrazine Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.06.54 6-Chloro-4-N-ethyl-2-N-propan-2-yl-1,3,5-triazine-2,4-diamine (Atrazine) (CAS No. 1912–24–9) (provided for in subheading 2933.69.60) Free No change No change On or before 12/31/2020 . 548. Simazine Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.06.55 6-Chloro-2-N,4-N-diethyl-1,3,5-triazine-2,4-diamine (Simazine) (CAS No. 122–34–9) (provided for in subheading 2933.69.60) Free No change No change On or before