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1-(1-NAPHTHYL)-2-THIOUREA structure
Chemical Name:
ANTU;AUTU;Bantu;Dirax;Alrato;u-5227;Kripid;Krysid;Rat-Tu;U 5227
Molecular Formula:
Formula Weight:
MOL File:

1-(1-NAPHTHYL)-2-THIOUREA Properties

Melting point:
193 °C
refractive index 
1.5500 (estimate)
storage temp. 
Poison room
Crystals or Crystalline Powder
Grayish to beige-brown
Exposure limits
NIOSH REL: TWA 0.3 mg/m3, IDLH 100 mg/m3; OSHA PEL: TWA 0.3 mg/m3
CAS DataBase Reference
86-88-4(CAS DataBase Reference)
  • Risk and Safety Statements
  • Hazard and Precautionary Statements (GHS)
Hazard Codes  T+
Risk Statements  28-40
Safety Statements  28-36/37-45-25-23
RIDADR  1651
WGK Germany  2
RTECS  YT9275000
HazardClass  6.1
PackingGroup  I
HS Code  29309090
Toxicity Acute oral LD50 for Norwegian rats 6–8 mg/kg (Hartley and Kidd, 1987).
Signal word: Danger
Hazard statements:
Code Hazard statements Hazard class Category Signal word Pictogram P-Codes
H300 Fatal if swallowed Acute toxicity,oral Category 1, 2 Danger P264, P270, P301+P310, P321, P330,P405, P501
H351 Suspected of causing cancer Carcinogenicity Category 2 Warning P201, P202, P281, P308+P313, P405,P501
Precautionary statements:
P309 IF exposed or if you feel unwell:
P310 Immediately call a POISON CENTER or doctor/physician.
P301+P330+P331 IF SWALLOWED: Rinse mouth. Do NOT induce vomiting.

1-(1-NAPHTHYL)-2-THIOUREA price More Price(4)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich 45328 ANTU PESTANAL 86-88-4 250mg $38.6 2018-11-20 Buy
Alfa Aesar A19024 N-(1-Naphthyl)thiourea, 97% 86-88-4 50g $130 2018-11-13 Buy
Alfa Aesar A19024 N-(1-Naphthyl)thiourea, 97% 86-88-4 10g $34.8 2018-11-13 Buy
Alfa Aesar A19024 N-(1-Naphthyl)thiourea, 97% 86-88-4 250g $569 2018-11-13 Buy

1-(1-NAPHTHYL)-2-THIOUREA Chemical Properties,Uses,Production

Chemical Properties

greyish to beige-brown crystals or cryst. powder

Chemical Properties

Alpha-naphthylthiourea (α-naphthalene thiourea) is a pure white or beige-brown solid/ blue-gray powder. It is hard to dissolve in water, acid, and general organic solvents, but dissolves in boiling ethanol and alkaline solution. On decomposition, ANTU releases carbon monoxide, toxic and irritating fumes and gases, and carbon dioxide. It is a rodenticide and a poison bait to lure rodents.

Chemical Properties

ANTU is a noncombustible, white crystalline solid or gray powder. Odorless.


Rodenticide. Specific control for the adult Norway rat; less toxic to other rat species.



General Description

White crystal or powder; technical product is gray powder. Has no odor but a bitter taste. Used primarily as a rodenticide for control of adult Norway rats. Not produced commercially in the U.S.

Air & Water Reactions

Slightly soluble in water.

Reactivity Profile

1-(1-NAPHTHYL)-2-THIOUREA is incompatible with the following: Strong oxidizers, silver nitrate .


Toxic by ingestion

Health Hazard

Moderately toxic: probable oral lethal dose (human) 0.5-5 gm/kg, or between 1 ounce and 1 pint (or l lb.) for 150 lb. person. Chronic sublethal exposure may cause antithyroid activity. Can produce hyperglycemia of three times normal in three hours. People with chronic respiratory disease or liver disease may be especially at risk.

Health Hazard

α-Naphthalene thiourea, a rodenticide, is very toxic and is fatal if swallowed. Exposures to ANTU cause poisoning with symptoms that include, but are not limited to, headache, weakness, dizziness, shortness of breath, cyanosis, blood abnormalities, methemoglobinemia, irritation of the digestive tract, liver and kidney damage, cardiac and CNS disturbances, convulsions, tachycardia, dyspnea, vertigo, tinnitus, weakness, disorientation, lethargy, drowsiness, and fi nally coma and death. The target organs include the blood, kidneys, CNS, liver, lungs, cardiovascular system, and blood-forming organs.

Fire Hazard

Emits sulfur dioxide, oxides of nitrogen, and carbon monoxide fumes upon decomposition. 1-(1-NAPHTHYL)-2-THIOUREA reacts with silver nitrate and strong oxidizers. Avoid decomposing heat.

Safety Profile

Poison by ingestion and intraperitoneal routes. Moderately toxic to humans by an unspecified route. Questionable carcinogen with experimental tumorigenic data. Mutagenic data. A rodenticide used extensively. Death is caused by pulmonary edema. Chronic toxicity has been known to cause dermatitis and a decrease in the white blood cells. When heated to decomposition it emits toxic fumes of NOx and SOx.

Potential Exposure

ANTU or its formulations are used as a rodenticide.

First aid

If this chemical gets into the eyes, remove any contact lenses at once and irrigate immediately for at least 15 minutes, occasionally lifting upper and lower lids. Seek medical attention immediately. If this chemical contacts the skin, remove contaminated clothing and wash immediately with soap and water. Seek medical attention immediately. If this chemical has been inhaled, remove from exposure, begin rescue breathing (using universal precautions, including resuscitation mask) if breathing has stopped and CPR if heart action has stopped. Transfer promptly to a medical facility. When this chemical has been swallowed, get medical attention. Give large quantities of water and induce vomiting. Do not make an unconscious person vomit. Medical observation is recommended for 24 to 48 hours after breathing overexposure, as pulmonary edema may be delayed. As first aid for pulmonary edema, a doctor or authorized paramedic may consider administering a drug or other inhalation therapy.

Environmental Fate

Chemical/Physical. The hydrolysis rate constant for ANTU at pH 7 and 25°C was determined to be 8 × 10–5/hour, resulting in a half-life of 361 days (Ellington et al., 1988)
Emits very toxic fumes of nitrogen and sulfur oxides when heated to decomposition (Lewis, 1990)


α-Naphthalene thiourea should be kept stored in a tightly closed container in a locked poison room, in a cool, dry, well-ventilated area away from incompatible substances.


UN1651 Naphthylthiourea, Hazard Class: 6.1; Labels: 6.1-Poisonous materials.

Purification Methods

Crystallise ANTU from EtOH. [Beilstein 12 III 2941, 12 IV 3086.]


Incompatible with oxidizers (chlorates, nitrates, peroxides, permanganates, perchlorates, chlorine, bromine, fluorine, etc.); contact may cause fires or explosions. Keep away from alkaline materials, strong bases, strong acids, oxoacids, epoxides, silver nitrate.

Waste Disposal

Incinerate in a furnace equipped with an alkaline scrubber. Consult with environmental regulatory agencies for guidance on acceptable disposal practices. Generators of waste containing this contaminant (≥100 kg/mo) must conform with EPA regulations governing storage, transportation, treatment, and waste disposal.


Workers should use/handle α-naphthalene thiourea with adequate ventilation. During use, dust generation and accumulation should be minimum, and avoid contact with the eyes, skin, and clothing.

1-(1-NAPHTHYL)-2-THIOUREA Preparation Products And Raw materials

Raw materials

Preparation Products

1-(1-NAPHTHYL)-2-THIOUREA Suppliers

Global( 78)Suppliers
Supplier Tel Fax Email Country ProdList Advantage
Mainchem Co., Ltd.
+86-0592-6210733 CHINA 32606 55
Hubei Jusheng Technology Co.,Ltd.
86-188-71490254 CHINA 20177 58
Alfa Aesar 400-610-6006; 021-67582000
021-67582001/03/05 China 30273 84
ShangHai YuanYe Biotechnology Co., Ltd. 021-61312847 qq:2797782341
021-55068248 China 7581 60
Thermo Fisher Scientific 800-810-5118
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Shanghai T&W Pharmaceutical Co., Ltd. +86 21 61551611
+86 21 50676805 China 9950 58
03-3668-0520 Japan 28557 80
TCI Europe +32 (0)3 735 07 00
+32 (0)3 735 07 01 Europe 28001 75
TCI AMERICA +1-800-423-8616 / +1-503-283-1681
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HBCChem, Inc. +1-510-219-6317
+1-650-486-1361 United States 10722 60

1-(1-NAPHTHYL)-2-THIOUREA Spectrum

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