12/31/2020 . 154. (E)-4-(2,6,6-Trimethyl-1-cyclohexen-1-yl)-3-bute Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.02.55 (3E)-4-(2,6,6-Trimethyl-2-cyclohexen-1-yl)-3-buten-2-one (CAS No. 79–77–6) (provided for in subheading 2914.23.00) Free No change No change On or before 12/31/2020 . 155. Ionone gamma methyl Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.02.56 3-Methyl-4-(2,6,6-trimethylcyclohex-2-enyl)but-3-en-2-one (Methylionone)(CAS No. 1335–46–2) (provided for in subheading 2914.23.00) Free No change No change On or before 12/31/2020 . 156. 1,3-Cyclohexanedione Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.02.57 1,3-Cyclohexanedione (CAS No. 504–02–9) (provided for in subheading 2914.29.50) Free No change No change On or before 12/31/2020 . 157. Benzobicyclon Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.02.58 3-[2-Chloro-4-(methylsulfonyl)benzoyl]-4-(phenylsulfanyl)bicyclo[3.2.1]oct-3-en-2-one (Benzobicyclon) (CAS No. 156963–66–5) (provided for in subheading 2914.29.50) Free No change No change On or before 12/31/2020 . 158. Cyclopentanone Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.02.59 Cyclopentanone (CAS No. 120–92–3) (provided for in subheading 2914.29.50) 1.7% No change No change On or before 12/31/2020 . 159. Benzophenone Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.02.60 Benzophenone (CAS No. 119–61–9) (provided for in subheading 2914.39.90) Free No change No change On or before 12/31/2020 . 160. 5-Chloro-1-indanone Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.02.61 5-Chloro-1-indanone (CAS No. 42348–86–7) (provided for in subheading 2914.39.90) Free No change No change On or before