acid (Daminozide) (CAS No. 1596–84–5) (provided for in subheading 2928.00.50) Free No change No change On or before 12/31/2020 . 387. Aminoguanidine bicarbonate Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.04.92 Aminoguanidine bicarbonate (CAS No. 2582–30–1) (provided for in subheading 2928.00.50) Free No change No change On or before 12/31/2020 . 388. ADH Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.04.93 Adipic dihydrazide (Hexanedihydrazide) (CAS No. 1071–93–8) (provided for in subheading 2928.00.50) Free No change No change On or before 12/31/2020 . 389. Certain organic chemicals Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.04.94 Bitolylene diisocyanate (3,3'-dimethylbiphenyl-4,4'-diyl diisocyanate ) (CAS No. 91–97–4) (provided for in subheading 2929.10.20) Free No change No change On or before 12/31/2020 . 390. p-Chlorophenylisocyanate Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.04.95 4-Chlorophenyl isocyanate (CAS No.104–12–1) (provided for in subheading 2929.10.80) Free No change No change On or before 12/31/2020 . 391. Phenylisocyanate Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.04.96 Phenyl isocyanate (CAS No. 103–71–9) (provided for in subheading 2929.10.80) Free No change No change On or before 12/31/2020 . 392. PCM Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.04.97 Ethyl [4-chloro-2-fluoro-5-[[[[methyl (1-methylethyl)amino] sulfonyl]amino] carbonyl]phenyl] carbamate (CAS No. 874909–61–2) (provided for in subheading 2929.90.15) 5.7% No change No change On or before 12/31/2020 . 393. NBPT Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.04.97 N-Butylthiophosphoric triamide (CAS No.