of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.06.98 5-Amino-1,2-dihydro-3H-1,2,4-triazole-3-thione (CAS No.16691–43–3) (provided for in subheading 2933.99.97) Free No change No change On or before 12/31/2020 . 592. Hexythiazox Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.06.99 (4RS,5RS)-5-(4-chlorophenyl)-N-cyclohexyl-4-methyl-2-oxo-1,3-thiazolidine-3-carboxamide (Hexythiazox) (CAS No. 78587–05–0) (provided for in subheading 2934.10.10) 1.8% No change No change On or before 12/31/2020 . 593. Thiacloprid Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.07.01 3-[(6-Chloro-3-pyridinyl)methyl]-1,3-thiazolidin-2-ylidenecyanamide (Thiacloprid) (CAS No. 111988–49–9) (provided for in subheading 2934.10.10) Free No change No change On or before 12/31/2020 . 594. Ruzasvir (MK-8408) Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.07.02 Methyl {(2S)-1-[(2S)-2-{5-[(6S)-6-(2-cyclopropyl-1,3-thiazol-5-yl)-1-fluoro-3-{2-[(2S)-1-{(2S)-2-[(methoxycarbonyl)amino]-3-methylbutanoyl}-2-pyrrolidinyl]-1H-imidazol-5-yl}indolo[1,2-c][1,3]benzoxazin-10-yl]-1H-imidazol-2-yl}-1-pyrrolidinyl]-3-methyl-1-oxo-2-butanyl}carbamate (Ruzasvir) (CAS No. 1613081–64–3) (provided for in subheading 2934.10.10) Free No change No change On or before 12/31/2020 . 595. Isavuconazonium sulfate Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.07.03 (2-{[(1-{1- [(2R,3R)-3-[4-(4- Cyanophenyl)-1,3-thiazol-2-yl] -2-(2,5-difluorophenyl)-2-hydroxybutyl] -1H-1,2,4-triazol-4-ium-4- yl}ethoxy) carbonyl] (methyl)amino}-3-pyridinyl)methyl N- methylglycinate hydrogen sulfate (Isavuconazonium Sulfate) (CAS No. 946075–13–4) (provided for in subnheading 2934.10.10) Free No change No change On or before 12/31/2020 . 596. 2-(1,3-Thiazol-5-yl)-2H-3,1-benzoxazine derivative Subchapter II of chapter 99