99 is amended by inserting in numerical sequence the following new heading: 9902.04.58 1,1'-[1,3-Phenylenebis(methylene)]bis(3-methyl-1H-pyrrole-2,5-dione) (CAS No. 119462–56–5) (provided for in subheading 2925.19.42) Free No change No change On or before 12/31/2020 . 354. Dodine Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.04.59 1-Dodecylguanidine acetate (Dodine) (CAS No. 2439–10–3) (provided for in subheading 2925.19.91) Free No change No change On or before 12/31/2020 . 355. N,N'-m-Phenylenedimaleimide Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.04.60 1,1'-(1,3-Phenylene)bis(1H-pyrrole-2,5-dione) (CAS No. 3006–93–7) (provided for in subheading 2925.19.91) Free No change No change On or before 12/31/2020 . 356. 1,3-Diphenylguanidine Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.04.61 1,3-Diphenylguanidine (CAS No. 102–06–7) (provided for in subheading 2925.29.60) Free No change No change On or before 12/31/2020 . 357. Flumiclorac pentyl ester Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.04.62 Pentyl [2-chloro-5-(1,3-dioxo-1,3,4,5,6,7-hexahydro-2H-isoindol-2-yl)-4-fluorophenoxy]acetate (Flumiclorac pentyl ester) (CAS No. 87546–18–7) (provided in subheading 2925.29.60) Free No change No change On or before 12/31/2020 . 358. Creatine Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.04.63 Creatine (N-carbamimidoyl-N-methylglycine) (CAS No. 57–00–1) (provided for in subheading 2925.29.90) Free No change No change On or before 12/31/2020 . 359. CreAMINO Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.04.64 N-Carbamimidoylglycine (Guanidinoacetic acid) (CAS No. 352–97–6) (provided for in subheading 2925.29.90) Free No change No change On or before 12/31/2020 .