idinyl]-3-methyl-1-oxo-2-butanyl}carbamate (Elbasvir) (CAS No. 1370468–36–2) (provided for in subheading 2934.99.30) Free No change No change On or before 12/31/2020 . 632. Uprifosbuvir (MK-3682) Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.07.40 Propan-2-yl (2R)-2-{((R)- ({(2R,3R,4R,5R)-4-chloro-5-(2,4-dioxo-3, 4-dihydropyrimidin-1(2H)-yl)-3-hydroxy-4- methyloxolan-2-yl} methoxy)(phenoxy)phosphoryl) amino}propanoate (Uprifosbuvir) (CAS No.1496551–77–9) (provided for in subheading 2934.99.30 or 2934.99.39) Free No change No change On or before 12/31/2020 . 633. Suvorexant (MK-4305) Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.07.41 [(7R)-4-(5-Chloro-1,3-benzoxazol-2-yl)-7-methyl-1,4-diazepan-1-yl][5-methyl-2-(2H-1,2,3-triazol-2-yl)phenyl]methanone (Suvorexant) (CAS No. 1030377–33–3) (provided for in subheading 2934.99.30) Free No change No change On or before 12/31/2020 . 634. Ertugliflozin L-pyroglutamic acid Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.07.42 (2S)-5-Oxopyrrolidine-2-carboxylic acid-(1S,2S,3S,4R,5S)-5-[4-chloro-3-(4-ethoxybenzyl)phenyl]-1-(hydroxymethyl)-6,8-dioxabicyclo[3.2.1]octane-2,3,4-triol (1:1) (Ertugliflozin L-pyroglutamic acid) (CAS No. 1210344–83–4) (provided for in subheading 2934.99.30) Free No change No change On or before 12/31/2020 . 635. Isoxadifen-ethyl Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.07.43 Ethyl 5,5-diphenyl-4H-1,2-oxazole-3-carboxylate (Isoxadifen-ethyl) (CAS No. 163520–33–0) (provided for in subheading 2934.99.39) 4.7% No change No change On or before 12/31/2020 . 636. NA-11 Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.07.44 Sodium 2-2'-methylene bis-(4,6-di-tert-butyl phenyl)phosphate (CAS No. 85209–91–2) (provided for in subheading 2934.99.39) Free No change No