sequence the following new heading: 9902.06.05 Methyl {(2S,3R)-1-[(2S)-2-{5-[(2R,5R)-1-{3,5-difluoro-4-[4-(4-fluorophenyl)-1-piperidinyl]phenyl}-5-(6-fluoro-2-{(2S)-1-[N-(methoxycarbonyl)-O-methyl-L-threonyl]-2-pyrrolidinyl}-1H-benzimidazol-5-yl)- 2-pyrrolidinyl]-6-fluoro-1H-benzimidazol-2-yl}-1-pyrrolidinyl]-3-methoxy-1-oxo-2-butanyl}carbamate (Pibrentasvir) (CAS No. 1353900–92–1) (provided for in subheading 2933.39.41) Free No change No change On or before 12/31/2020 . 499. Relebactam (MK-7655) Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.06.06 (2S,5R)-7-Oxo-N-(piperidin-4-yl)-6-(sulfooxy)-1,6-diazabicyclo[3.2.1]octane-2-carboxamide (CAS No.1174018–99–5) (provided for in subheading 2933.39.41) Free No change No change On or before 12/31/2020 . 500. 2,3-Dichloro-5-(trifluoromethyl)pyridine Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.06.07 2,3-Dichloro-5-(trifluoromethyl)pyridine (CAS No. 69045–84–7) (provided for in subheading 2933.39.61) 1.2% No change No change On or before 12/31/2020 . 501. 2-Acetylnicotinic acid Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.06.08 2-Acetylnicotinic acid (CAS No. 89942–59–6) (provided for in subheading 2933.39.61) Free No change No change On or before 12/31/2020 . 502. Hindered amine light stabilizer Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.06.09 Bis(2,2,6,6-tetramethyl-1-octyloxy-4-piperidyl) sebacate (CAS No. 129757–67–1) (provided for in subheading 2933.39.61) Free No change No change On or before 12/31/2020 . 503. 5-Methylmethoxypyridine-2,3-dicar Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.06.10 5-Methylmethoxypyridine-2,3-dicarboxylic acid (CAS No. 143382–03–0) (provided for in subheading 2933.39.61) 4.0% No change No change On or before 12/31/2020 . 504.