Heading 2934: Nucleic acids and their salts, whether or not chemically defined; other heterocyclic compounds

In chapter 29, Organic chemicals. 40 rate lines, laid out as HTS Revision 20 (2026) prints them.

HTS number	Description	Units	General	Special	Column 2
2934	Nucleic acids and their salts, whether or not chemically defined; other heterocyclic compounds:
2934.10	Compounds containing an unfused thiazole ring (whether or not hydrogenated) in the structure:
	Aromatic or modified aromatic:
2934.10.10.00	Products described in additional U.S. note 3 to section VI	kg	6.5%	Free (A+,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG) 3.25% (JP)	15.4¢/kg + 52%
2934.10.20.00	Other	kg	6.5%	Free (A+,AU,BH,CL,CO,D, E,IL,JO,K, KR,MA,OM,P, PA,PE,S,SG)	15.4¢/kg + 52%
	Other:
2934.10.70.00	4,5-Dichloro-2-n-octyl-4-isothiazolin-3-one; Ethyl 2-(2-aminothiazol-4-yl)-2- hydroxyiminoacetate; Ethyl 2-(2-aminothiazol-4-yl)-2- methoxyiminoacetate; 2-Methyl-4-isothiazolin- 3-one; 2-n-Octyl-4-isothiazolin-3-one; and Thiothiamine hydrochloride	kg	Free		30.5%
2934.10.90.00	Other	kg	6.5%	Free (A,AU,BH,CL,CO,D,E,IL,JO,K,KR,L,MA,OM,P,PA,PE,S,SG) 3.25% (JP)	30.5%
2934.20	Compounds containing in the structure a benzothiazole ring-system (whether or not hydrogenated), not further fused:
2934.20.05.00	N-tert-Butyl-2-benzothiazolesulfenamide	kg	6.5%	Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG)	15.4¢/kg + 52%
2934.20.10.00	2,2'-Dithiobisbenzothiazole	kg	6.5%	Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG)	15.4¢/kg + 57%
2934.20.15.00	2-Mercaptobenzothiazole; andN-(Oxydiethylene)benzothiazole-2-sulfenamide	kg	6.5%	Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG)	15.4¢/kg + 52%
2934.20.20.00	2-Mercaptobenzothiazole, sodium salt (2-Benzothiazolethiol, sodium salt)	kg	6.5%	Free (A+,AU,BH,CL,CO,D, E,IL, JO, KR,MA,OM,P, PA,PE,S,SG)	15.4¢/kg + 40%
2934.20.25.00	2-Amino-5,6-dichloro benzo thiazole; 2-(4-Amino phenyl)-6-methyl benzo thiazole-7- sulfonic acid; 2-Amino-6-nitro benzo thiazole; andN,N-Di cyclo hexyl-2-benzo thiazole sulfenamide	kg	Free		15.4¢/kg + 52%
2934.20.30.00	2-Amino-6-methoxy benzo thiazole; 2-Amino-6-methyl benzo thiazole; 6-Ethoxy-2-benzo thiazo lethiol; 3-Methyl benzo thiazole-2-hydrazone; and Primuline base	kg	5.8%	Free (A+,AU,BH,CL,CO,D, E,IL,JO,KR, L,MA,OM,P, PA,PE,S,SG)	15.4¢/kg + 39.5%
	Other:
2934.20.35.00	Pesticides	kg	6.5%	Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG)	15.4¢/kg + 40%
	Other:
2934.20.40.00	Products described in additional U.S. note 3 to section VI	kg	6.5%	Free (A+,AU,BH,CL,CO,D, E,IL,JO,K, KR,L,MA,OM,P, PA,PE,S,SG)	15.4¢/kg + 52%
2934.20.80.00	Other	kg	6.5%	Free (A+,AU,BH,CL,CO,D, E,IL,JO,K, KR,L,MA,OM,P, PA,PE,S,SG)	15.4¢/kg + 52%
2934.30	Compounds containing in the structure a phenothiazine ring-system (whether or not hydrogenated), not further fused:
2934.30.12.00	2-(Trifluoromethyl)phenothiazine	kg	6.5%	Free (A+,AU,BH,CL,CO,D, E,IL, JO, KR,MA,OM,P, PA,PE,S,SG)	15.4¢/kg + 45%
2934.30.18.00	Ethyl (1H-phenothiazin-2,4,1)carbamate	kg	Free		15.4¢/kg + 52%
	Other:
	Drugs:
2934.30.23.00	Antidepressants, tranquilizers and other psychotherapeutic agents	kg	6.5%	Free (A+,AU,BH,CL,CO,D, E,IL,JO,K, KR,MA,OM,P, PA,PE,S,SG)	15.4¢/kg + 149.5%
2934.30.27.00	Other	kg	6.5%	Free (A+,AU,BH,CL,CO,D, E,IL,JO,K, KR,MA,OM,P, PA,PE,S,SG)	15.4¢/kg + 45%
	Other:
2934.30.43.00	Products described in additional U.S. note 3 to section VI	kg	6.5%	Free (A+,AU,BH,CL,CO,D, E,IL,JO,K, KR,MA,OM,P, PA,PE,S,SG)	15.4¢/kg + 52%
2934.30.50.00	Other	kg	6.5%	Free (A+,AU,BH,CL,CO,D, E,IL,JO,K, KR,MA,OM,P, PA,PE,S,SG)	15.4¢/kg + 52%
	Other:
2934.91.00.00	Aminorex (INN), brotizolam (INN), clotiazepam (INN), cloxazolam (INN), dextromoramide (INN), haloxazolam (INN), ketazolam (INN), mesocarb (INN), oxazolam (INN), pemoline (INN), phendimetrazine (INN), phenmetrazine (INN) and sufentanil (INN); salts thereof	kg	Free		15.4¢/kg + 52%
2934.92.00.00	Other fentanyls and their derivatives	kg	6.5%	Free (A,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG)	30.5%
2934.99	Other:
	Aromatic or modified aromatic:
2934.99.01.00	Mycophenolate mofetil	kg	Free		15.4¢/kg + 45%
2934.99.03.00	2-Acetylbenzo(b)thiophene; 3-Methylene-7-(2-phenoxyacetamido)- cephan-4-carboxylic acid, p-nitrobenzyl ester, 1-oxide; and Naphth[1,2-d]-[1,2,3]-oxadiazole-5-sulfonic acid and its sodium salt	kg	Free		15.4¢/kg + 52%
2934.99.05.00	5-Amino-3-phenyl-1,2,4-thiadiazole (3-Phenyl-5-amino-1,2,4-thiadiazole); 2-Hydroxybenzoxazole (Benzoxazolone); 4-Phenylmorpholine; 1,9-Thianthrenedicarboxylic acid; and Thioxanthene-9-one (Thioxanthone)	kg	5.8%	Free (A+,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG)	15.4¢/kg + 39.5%
2934.99.06.00	7-Nitronaphth[1,2]oxadiazole-5-sulfonic acid and its salts	kg	6.5%	Free (A+,AU,BH,CL,CO,D,E,IL,JO,KR,L,MA,OM,P,PA,PE,S,SG)	15.4¢/kg + 66.5%
2934.99.07.00	Ethyl 2-[4-[(6-chloro-2-benzoxazolyl)oxy]- phenoxy]propanoate (Fenoxaprop-ethyl)	kg	Free		15.4¢/kg + 48.5%
2934.99.08.00	2,5-Diphenyloxazole	kg	6.5%	Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG)	15.4¢/kg + 52%
2934.99.09.00	1,2-Benzisothiazolin-3-one	kg	Free		15.4¢/kg + 40.5%
	Other:
	Pesticides:
2934.99.11.00	2-tert-Butyl-4-(2,4-dichloro-5- isopropoxyphenyl)-Δ²-1,3,4- oxadiazolin-5-one; 3-Isopropyl-1H-2,1,3- benzothiadiazin-4-(3H)-one-2,2- dioxide (Bentazon); andO,O-Diethyl-S-[(6-chloro-2- oxobenzoxazolin-3-yl)methyl]- phosphorodithioate (Phosalone)	kg	6.5%	Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG)	15.4¢/kg + 40.5%
	Other:
2934.99.12.00	Fungicides	kg	6.5%	Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG)	15.4¢/kg + 40%
2934.99.15.00	Herbicides	kg	6.5%	Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) 3.25% (JP)	15.4¢/kg + 48.5%
2934.99.16.00	Insecticides	kg	6.5%	Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG)	15.4¢/kg + 64.5%
2934.99.18.00	Other	kg	6.5%	Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG)	15.4¢/kg + 40%
2934.99.20.00	Photographic chemicals	kg	6.5%	Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG)	15.4¢/kg + 50%
2934.99.30.00	Drugs	kg	6.5%	Free (A,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG)	15.4¢/kg + 45%
	Other:
2934.99.39.00	Products described in additional U.S. note 3 to section VI	kg	6.5%	Free (A+,AU,BH,CL,CO,D,E,IL,JO,K,KR,L,MA,OM,P,PA,PE,S,SG)	15.4¢/kg + 52%
2934.99.44.00	Other	kg	6.5%	Free (A+,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG)	15.4¢/kg + 52%
	Other:
2934.99.47	Drugs		3.7%	Free (A,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG)	25%
2934.99.47.20	Rocuronium (INN) and its salts	kg
2934.99.47.30	Tacrolimus (INN) and its salts	kg
2934.99.47.40	Timolol maleate and its salts	kg
2934.99.47.90	Other	kg
	Other:
2934.99.70.00	Morpholinoethyl chloride hydrochloride; 2-Methyl-2,5-dioxo-1-oxa-2-phospholan; and (6R-trans)-7-Amino-3-methyl-8-oxo-5- thia-1-azabicyclo[4.2.0]-oct-2-ene-2- carboxylic acid	kg	Free		30.5%
2934.99.90.01	Other	kg	6.5%	Free (A,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG)	30.5%

Rates are quoted as printed. Each 8-digit number opens its own page with footnotes and cited chapter 99 headings.

Watch lines in heading 2934

Pick the 8 or 10 digit numbers you import and we email you the old and new text whenever a new HTS revision changes them.

See the alert plans

No line in this heading cites a chapter 99 heading in its footnotes or rate columns.

What this page leaves to your broker

This page quotes the schedule. It does not add the rates together, and it does not say whether a chapter 99 heading applies to a shipment: that turns on the country of origin, the dates and the U.S. notes to chapter 99. Section 301, Section 232 and other chapter 99 measures list the goods they cover in those notes and in Federal Register notices, so a line can be covered by a heading its footnotes never cite. A licensed customs broker makes the determination.

Built September 29, 2026 from HTS Revision 20 (2026) (USITC release 2026HTSRev20, published September 23, 2026, current since September 28, 2026). The schedule changes often; USITC's own site always has the current text.