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

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Source: [2026 HTS Revision 21 (October 9, 2026)](https://hts.usitc.gov/search?query=2934). Additional duties by country of origin may apply; estimate a shipment's full duty with the tariff calculator: https://geopax.app/tariffs/calculator

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

| Code | Description | General | Special | Column 2 | Units |
| --- | --- | --- | --- | --- | --- |
| 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 | 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% | kg |
| 2934.10.20.00 |       Other | 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% | kg |
|  |     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 | Free |  | 30.5% | kg |
| 2934.10.90.00 |       Other | 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% | kg |
| 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 | 6.5% | Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) | 15.4¢/kg + 52% | kg |
| 2934.20.10.00 |     2,2'-Dithiobisbenzothiazole | 6.5% | Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) | 15.4¢/kg + 57% | kg |
| 2934.20.15.00 |     2-Mercaptobenzothiazole; andN-(Oxydiethylene)benzothiazole-2-sulfenamide | 6.5% | Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) | 15.4¢/kg + 52% | kg |
| 2934.20.20.00 |     2-Mercaptobenzothiazole, sodium salt (2-Benzothiazolethiol, sodium salt) | 6.5% | Free (A+,AU,BH,CL,CO,D, E,IL, JO, KR,MA,OM,P, PA,PE,S,SG) | 15.4¢/kg + 40% | kg |
| 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 | Free |  | 15.4¢/kg + 52% | kg |
| 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 | 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% | kg |
|  |     Other: |  |  |  |  |
| 2934.20.35.00 |       Pesticides | 6.5% | Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) | 15.4¢/kg + 40% | kg |
|  |       Other: |  |  |  |  |
| 2934.20.40.00 |         Products described in additional U.S. note 3 to section VI | 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% | kg |
| 2934.20.80.00 |         Other | 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% | kg |
| 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 | 6.5% | Free (A+,AU,BH,CL,CO,D, E,IL, JO, KR,MA,OM,P, PA,PE,S,SG) | 15.4¢/kg + 45% | kg |
| 2934.30.18.00 |     Ethyl (1H-phenothiazin-2,4,1)carbamate | Free |  | 15.4¢/kg + 52% | kg |
|  |     Other: |  |  |  |  |
|  |       Drugs: |  |  |  |  |
| 2934.30.23.00 |         Antidepressants, tranquilizers and other psychotherapeutic agents | 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% | kg |
| 2934.30.27.00 |         Other | 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% | kg |
|  |       Other: |  |  |  |  |
| 2934.30.43.00 |         Products described in additional U.S. note 3 to section VI | 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% | kg |
| 2934.30.50.00 |         Other | 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% | kg |
|  |   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 | Free |  | 15.4¢/kg + 52% | kg |
| 2934.92.00.00 |     Other fentanyls and their derivatives | 6.5% | Free (A,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG) | 30.5% | kg |
| 2934.99 |     Other: |  |  |  |  |
|  |       Aromatic or modified aromatic: |  |  |  |  |
| 2934.99.01.00 |         Mycophenolate mofetil | Free |  | 15.4¢/kg + 45% | kg |
| 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 | Free |  | 15.4¢/kg + 52% | kg |
| 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) | 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% | kg |
| 2934.99.06.00 |         7-Nitronaphth[1,2]oxadiazole-5-sulfonic acid and its salts | 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% | kg |
| 2934.99.07.00 |         Ethyl 2-[4-[(6-chloro-2-benzoxazolyl)oxy]- phenoxy]propanoate (Fenoxaprop-ethyl) | Free |  | 15.4¢/kg + 48.5% | kg |
| 2934.99.08.00 |         2,5-Diphenyloxazole | 6.5% | Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) | 15.4¢/kg + 52% | kg |
| 2934.99.09.00 |         1,2-Benzisothiazolin-3-one | Free |  | 15.4¢/kg + 40.5% | kg |
|  |         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) | 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% | kg |
|  |           Other: |  |  |  |  |
| 2934.99.12.00 |           Fungicides | 6.5% | Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) | 15.4¢/kg + 40% | kg |
| 2934.99.15.00 |           Herbicides | 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% | kg |
| 2934.99.16.00 |           Insecticides | 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% | kg |
| 2934.99.18.00 |           Other | 6.5% | Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) | 15.4¢/kg + 40% | kg |
| 2934.99.20.00 |           Photographic chemicals | 6.5% | Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) | 15.4¢/kg + 50% | kg |
| 2934.99.30.00 |           Drugs | 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% | kg |
|  |           Other: |  |  |  |  |
| 2934.99.39.00 |           Products described in additional U.S. note 3 to section VI | 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% | kg |
| 2934.99.44.00 |           Other | 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% | kg |
|  |       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 | 3.7% | Free (A,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG) | 25% | kg |
| 2934.99.47.30 |           Tacrolimus (INN) and its salts | 3.7% | Free (A,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG) | 25% | kg |
| 2934.99.47.40 |           Timolol maleate and its salts | 3.7% | Free (A,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG) | 25% | kg |
| 2934.99.47.90 |           Other | 3.7% | Free (A,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG) | 25% | 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 | Free |  | 30.5% | kg |
| 2934.99.90.01 |           Other | 6.5% | Free (A,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG) | 30.5% | kg |