. 4614. Thifensulfuron formulations Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.24.26 Formulations of 3-[(4-methoxy-6-methyl-1,3,5-triazin-2-yl)carbamoylsulfamoyl] thiophene-2-carboxylic acid (Thifensulfuron) (CAS No. 79277–67–1) and application adjuvants (provided for in subheading 3808.93.50) Free No change No change On or before 12/31/2024 . 4615. Tolpyralate and Nicosulfuron herbicides Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.24.27 Formulations of (RS)-1-{1-ethyl-4-[4-mesyl-3-(2-methoxyethoxy)-o-toluoyl]pyrazol-5-yloxy}ethyl methyl carbonate (Tolpyralate) (CAS No. 1101132–67–5) and 2-[(4,6-dimethoxypyrimidin-2-yl)carbamoylsulfamoyl]-N,N-dimethylpyridine-3-carboxamide (Nicosulfuron) (CAS No. 111991–09–4) (provided for in subheading 3808.93.50) Free No change No change On or before 12/31/2024 . 4616. Mixtures of magnesium salts and application adjuvants Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.24.28 Mixtures of magnesium dinitrate (CAS No. 10377–60–3), 5-chloro-2-methyl-1,2-thiazol-3-one (CAS No. 26172–55–4), 2-methyl-1,2-thiazol-3-one (CAS No. 2682–20–4), magnesium dichloride (CAS No. 7786–30–3), and application adjuvants (provided for in subheading 3808.94.50) Free No change No change On or before 12/31/2024 . 4617. Nisin formulations Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.24.29 Nisin preparations including 2.5 percent Nisin and 92 percent salt (CAS No. 1414–45–5) (provided for in subheading 3808.99.95) Free No change No change On or before 12/31/2024 . 4618. Certain fixatives Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.24.30 Dye fixative used in the textile industry containing benzenesulfonic acid, hydroxy-, sodium salt (1:1), polymer with formaldehyde and 4,4′-sulfonylbis(phenol) (CAS No.