; and (B) by striking 12/31/2020 and inserting 12/31/2024 . (173) Paclobutrazol formulations Heading 9902.09.92 is amended— (A) by amending the article description to read as follows: Mixtures of (2RS, 3RS)-1-(4-chlorophenyl)-4,4-dimethyl-2-(1H-1,2,4-triazol-1-yl)pentan-3-ol (Paclobutrazol) (CAS No. 76738–62–0) and application adjuvants (provided for in subheading 3808.93.15) ; and (B) by striking 12/31/2020 and inserting 12/31/2024 . (174) Prosulfuron Heading 9902.09.93 is amended— (A) by amending the article description to read as follows: Mixtures of N-[(4-methoxy-6-methyl-1,3,5-triazin-2-yl)carbamoyl]-2-(3,3,3-trifluoropropyl) benzenesulfonamide (Prosulfuron) (CAS No. 94125–34–5) and application adjuvants (provided for in subheading 3808.93.15) ; and (B) by striking 12/31/2020 and inserting 12/31/2024 . (175) Mixtures of rimsulfuron Heading 9902.10.03 is amended— (A) by amending the article description to read as follows: Mixtures of N-[[(4,6-dimethoxy-2-pyrimidinyl) amino] carbonyl]-3-(ethylsulfonyl)-2-pyridinesulfonamide (Rimsulfuron) (CAS No. 122931–48–0) and application adjuvants (provided for in subheading 3808.93.15) ; and (B) by striking 12/31/2020 and inserting 12/31/2024 . (176) Certain herbicides for use on cereals Heading 9902.10.04 is amended— (A) by amending the article description to read as follows: Product mixtures containing methyl 4-{[(3-methoxy-4-methyl-5-oxo-4,5-dihydro-1H-1,2,4-triazol-1-yl)carbonyl] sulfamoyl}-5-methyl-3-thiophenecarboxylate (Thiencarbazone-methyl) (CAS No. 317815–83–1), methyl 2-{[(4,6-dimethoxy-2-pyrimidinyl) carbamoyl] sulfamoyl}-4-{[(methylsulfonyl)amino]methyl} benzoate (Mesosulfuron-methyl) (CAS No. 208465–21–8) and diethyl 1-(2,4-dichlorophenyl)-5-methyl-4,5-dihydro-1H-pyrazole -3,5-dicarboxylate (Mefenpyr-diethyl) (CAS No. 135590–91–9) (provided for in subheading 3808.93.15)