; (B) by striking Free and inserting 2.5% ; and (C) by striking 12/31/2020 and inserting 12/31/2024 . (5) 3,3′ Dichlorobenzidine dihydrochloride Heading 9902.03.88 is amended— (A) by amending the article description to read as follows: 3,3′-Dichlorobenzidine dihydrochloride (3,3′-Dichloro-4,4′-biphenyldiamine dihydrochloride) (CAS No. 612–83–9) (provided for in subheading 2921.59.80) ; (B) by striking Free and inserting 0.9% ; and (C) by striking 12/31/2020 and inserting 12/31/2024 . (6) 4-(4-Aminophenoxy)aniline Heading 9902.04.01 is amended— (A) by amending the article description to read as follows: 4-(4-Aminophenoxy)aniline (CAS No. 101–80–4) (provided for in subheading 2922.29.81) ; (B) by striking 1.3% and inserting 3.3% ; and (C) by striking 12/31/2020 and inserting 12/31/2024 . (7) S-Metolachlor Heading 9902.04.43 is amended— (A) by amending the article description to read as follows: 2-Chloro-N-(2-ethyl-6-methylphenyl)-N-[(1S)-2-meth- oxy-1-methylethyl]acetamide ((S)-Metolachlor) (CAS No. 87392–12–9) (provided for in subheading 2924.29.47) ; (B) by striking 6.0% and inserting 6.3% ; and (C) by striking 12/31/2020 and inserting 12/31/2024 . (8) Compound used in polymer production Heading 9902.04.58 is amended— (A) by amending the article description to read as follows: 1,1′-[1,3-Phenylenebis(methylene)]bis(3-methyl-1H-pyr- role-2,5-dione) (CAS No. 119462–56–5) (provided for in subheading 2925.19.42) ; (B) by striking Free and inserting 2.7% ; and (C) by striking 12/31/2020 and inserting 12/31/2024 . (9) 2-Methoxlyethyl(rs)-2-(4-tert-(cyflumetofen) Heading 9902.04.66 is amended— (A) by amending the article description to read as follows: 2-Methoxyethyl 2-cyano-2-[4-(2-methyl-2-propanyl)phe- nyl]-3-oxo-3-[2-(trifluoromethyl)phenyl]propanoate (Cyflumetafen) (CAS No. 400882–07–7) (provided for in subheading 2926.90.25) ; (B) by striking Free and inserting 1.5%