sequence the following new heading: 9902.25.64 Poly (hexamethylenebiguanide) hydrochloride (Polyhexanide) (CAS No. 32289–58–0) (provided for in subheading 3911.90.90) Free No change No change On or before 12/31/2024 . 4750. Ethylene-norbornene copolymer Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.25.65 Poly(ethylene-ran-(2-norbornene)), substantially amorphous, having a glass transition temperature less than 145 °C (CAS No. 26007–43–2) (provided for in subheading 3911.90.90) Free No change No change On or before 12/31/2024 . 4751. Cellulose powder Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.25.66 Cellulose entirely spherical micro-spheres, each with mean particle size of 1 to 25 µm (CAS No. 9004–34–6) (provided for in subheading 3912.90.00) Free No change No change On or before 12/31/2024 . 4752. Polymaltotriose Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.25.67 Poly[6)-α-D-glucopyranosyl-(1->4)-α-D-glucopyranosyl-(1->4)-α-D-glucopyranosyl-(1->] (Polymaltotriose) (CAS No. 9057–02–7) (provided for in subheading 3913.90.20) 1.7% No change No change On or before 12/31/2024 . 4753. Chitosan Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.25.68 Chitosan (methyl N-[(2S,3R,4R,5S,6R)-5-[(2S,3R,4R,5S,6R)-3-amino-5-[(2S,3R,4R,5S,6R)-3-amino-5-[(2S,3R,4R,5S,6R)-3-amino-5-[(2S,3R,4R,5S,6R)-3-amino-5-[(2S,3R,4R,5S,6R)-3-amino-5-[(2S,3R,4R,5S,6R)-3-amino-4,5-dihydroxy-6-(hydroxymethyl)oxan-2-yl]oxy-4-hydroxy-6-(hydroxymethyl)oxan-2-yl]oxy-4-hydroxy-6-(hydroxymethyl)oxan-2-yl]oxy-4-hydroxy-6-(hydroxymethyl)oxan-2-yl]oxy-4-hydroxy-6-(hydroxymethyl)oxan-2-yl]oxy-4-hydroxy-6-(hydroxymethyl)oxan-2-yl]oxy-2-[(2R,3S,4R,5R,6S)-5-amino-6-[(2R,3S,4R,5R,6R)-5-amino-4,6-dihydroxy-2-(hydroxymethyl)oxan-3-yl]oxy-4-hydroxy-2-(hydroxymethyl)oxan-3-yl]oxy-4-hydroxy-6-(hydroxymethyl)oxan-3-yl]carbamate)