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. 5-Methylpyridine-2,3-dicarboxylic acid Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.06.11 Dimethyl 5-methylpyridine-2,3-dicarboxylate (CAS No. 112110–16–4) (provided for in subheading 2933.39.61) Free No change No change On or before 12/31/2020 . 505. 5-Methylpyridine-2,3-dicarboxylic acid (5-MPDC) Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.06.12 5-Methylpyridine-2,3-dicarboxylic acid (CAS No. 53636–65–0) (provided for in subheading 2933.39.61) Free No change No change On or before 12/31/2020 . 506. 2,3-Pyridinedicarboxylic acid Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.06.13 2,3-Pyridinedicarboxylic acid (CAS No. 89–00–9) (provided for in subheading 2933.39.61) Free No change No change On or before 12/31/2020 . 507. N,N'-Bis(2,2,6,6-tetramethyl-4- (uvinul 4050) Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.06.14 N,N'-1,6-Hexanediylbis(2,2,6,6-tetramethyl-4-piperidinecarboxamide (CAS No. 124172–53–8) (provided for in subheading 2933.39.61) Free No change No change On or before 12/31/2020 . 508. Bis(1,2,2,6,6-pentamethyl-4-pi (tinuvin 765) Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.06.15 Bis(1,2,2,6,6-pentamethyl-4-piperidyl)sebacate (CAS No. 41556–26–7) and methyl 1,2,2,6,6-pentamethyl-4-piperidyl sebacate (CAS No. 82919–37–7) (provided for in subheading 2933.39.61) Free No change No change On or before 12/31/2020 . 509. N,N'-Bis(2,2,6,6-tetramethyl-4-piperidinyl)isoph Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new