sequence the following new heading: 9902.01.79 Lithium tetrahydridoaluminate(1-) (Lithium aluminum hydride) (CAS No. 16853–85–3) (provided for in subheading 2850.00.50) Free No change No change On or before 12/31/2020 . 81. Cyanamide Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.01.80 Cyanamide (CAS No. 420-04-2) (provided for in subheading 2853.90.90) Free No change No change On or before 12/31/2020 . 82. n-Butyl chloride Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.01.81 n-Butyl chloride (1-Chlorobutane) (CAS No. 109–69–3) (provided for in subheading 2903.19.60) Free No change No change On or before 12/31/2020 . 83. Hexane, 1,6-dichloro- Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.01.82 1,6-Dichlorohexane (CAS No. 2163–00–0) (provided for in subheading 2903.19.60) Free No change No change On or before 12/31/2020 . 84. Allyl bromide Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.01.83 Allyl Bromide (3-bromo-1-propene) (CAS No. 106–95–6) (provided for in subheading 2903.39.20) Free No change No change On or before 12/31/2020 . 85. DCP Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.01.84 1,6,7,8,9,14,15,16, 17,17,18,18- Dodecachloropentacyclo [12.2.1.1 6,9 .0 2,13 .0 5,10 ] octadeca-7,15-diene (CAS No. 13560-89-9) (provided for in subheading 2903.89.31) Free No change No change On or before 12/31/2020 . 86. Monochlorobenzene Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.01.85 Chlorobenzene (CAS No.108–90–7) (provided for in subheading 2903.91.10) 4.3% No change No change On or before 12/31/2020 . 87. o-Dichlorobenzene Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.01.86 o-Dichlorobenzene