new heading: 9902.21.17 3-[bis(2-Methylpropoxy)phosphinothioylsulfanyl]-2-methylpropanoic acid (CAS No. 268567–32–4) (provided for in subheading 2930.90.49) Free No change No change On or before 12/31/2025 . 11213. Sodium benzenesulfinate Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.21.18 Sodium benzenesulfinate (CAS No. 873–55–2) (provided for in subheading 2930.90.91) Free No change No change On or before 12/31/2025 . 11214. Thio-ether based co-stabilizer for plastics Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.21.19 1-(Octadecyldisulfanyl)octadecane (CAS No. 2500–88–1) (provided for in subheading 2930.90.91) Free No change No change On or before 12/31/2025 . 11215. L-Cysteine hydrate hydrochloride Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.21.20 (2R)-2-Amino-3-sulfanylpropanoic acid