change No change On or before 12/31/2020 . 526. 6-BA Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.06.33 N-Benzyl-3H-purin-6-amine (Benzyladenine) (CAS No.1214–39–7) (provided for in subheading 2933.59.15) Free No change No change On or before 12/31/2020 . 527. 5-Ethyl-6-octyl[1,2,4]triazol(ametoctradine) Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.06.34 5-Ethyl-6-octyl[1,2,4]triazolo[1,5-a]pyrimidin-7-amine (Ametoctradin) (CAS No. 865318–97–4) (provided for in subheading 2933.59.15) Free No change No change On or before 12/31/2020 . 528. Bromacil Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.06.35 5-Bromo-3-sec-butyl-6-methyluracil (Bromacil) (CAS No. 314–40–9) (provided for in subheading 2933.59.18) Free No change No change On or before 12/31/2020 . 529. Pirimiphos-methyl Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.06.36 O-(2-Diethylamino-6-methylpyrimidin-4-yl) O,O-dimethyl phosphorothioate (Pirimiphos-methyl) (CAS No. 29232–93–7) (provided for in subheading 2933.59.18) Free No change No change On or before 12/31/2020 . 530. Aminocyclopyrachlor Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.06.37 6-Amino-5-chloro-2-cyclopropyl-pyrimidine-4-carboxylic acid (Aminocyclopyrachlor) (CAS No. 858956–08–8) (provided for in subheading 2933.59.18) 1.5% No change No change On or before 12/31/2020 . 531. Letermovir (MK-8228) Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.06.38 {(4S)-8-Fluoro-2-[4-(3-methoxyphenyl)-1-piperazinyl]-3-[2-methoxy-5-(trifluoromethyl)phenyl]-3,4-dihydro-4-quinazolinyl}acetic acid (CAS No. 917389–32–3) (provided for in subheading 2933.59.36) Free No change No change On or before 12/31/2020 . 532. Benzo[h]quinazolin-4(3H)-one derivative