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CAS No. :	125-46-2
Formula :	C₁₈H₁₆O₇
M.W :	344.32
SMILES Code :	O=C(C1(C)C(OC2=C(C(C)=O)C(O)=C(C)C(O)=C12)=C3)C(C(C)=O)C3=O
Synonyms :	NSC 8517; Usniacin
MDL No. :	MFCD00065294
InChI Key :	CUCUKLJLRRAKFN-UHFFFAOYSA-N
Pubchem ID :	5646

GHS Pictogram:
Signal Word:	Warning
Hazard Statements:	H302-H335
Precautionary Statements:	P261

CaCo2 cells	5 µM	24 hours	Suppressed cell invasion	JACS Au. 2024 Apr 11;4(4):1521-1537
Clostridium perfringens	3 mM	48 hours	Inhibited the growth of C. perfringens	J Anim Sci Biotechnol. 2025 May 12;16(1):67
HEK293T cells	5, 10, 20 µM	48 hours	Suppressed AP-1, STAT3, and NF-κB activity	JACS Au. 2024 Apr 11;4(4):1521-1537
H520 cells	30 µM	12 hours	Usnic acid dose-dependently increased ROS levels in H520 cells	Int J Mol Sci. 2020 Jan 29;21(3):876
HCT116 cells	5 µM	24 hours	Suppressed cell invasion	JACS Au. 2024 Apr 11;4(4):1521-1537
Streptococcus mutans UA 159	0.48 to 250 μg/ml	1 min	To evaluate the anti-acidogenic and anti-aciduric effects of usnic acid on S. mutans biofilms. Results showed significant inhibition of acid production and ATPase activity in biofilm cells.	Biofilm. 2024 Nov 30;8:100241
Ca2+- or Zn2+-loaded liposomes	20 µM or 40 µM	10 minutes	Measure the efflux of Ca2+ or Zn2+ induced by usnic acid. Results showed Zn2+ efflux was faster than Ca2+.	Int J Mol Sci. 2022 Dec 19;23(24):16203
Calu-1 cells	30 µM	12 hours	Usnic acid dose-dependently increased ROS levels in Calu-1 cells	Int J Mol Sci. 2020 Jan 29;21(3):876
Sporozoites	30 µM	2 hours	Induced apoptosis in sporozoites and lowered mitochondrial membrane potential	J Anim Sci Biotechnol. 2025 May 12;16(1):67
Human blood cells	125 μg/mL	24 hours	Evaluate the cytotoxic effect of usnic acid on human blood cells, showing a significant decrease in cell viability and induction of early apoptosis	Antioxidants (Basel). 2021 Jul 23;10(8):1171
Human blood cells	75 μg/mL	24 hours	Evaluate the cytotoxic effect of usnic acid on human blood cells, showing a significant decrease in cell viability and induction of early apoptosis	Antioxidants (Basel). 2021 Jul 23;10(8):1171
Human blood cells	50 μg/mL	24 hours	Evaluate the cytotoxic effect of usnic acid on human blood cells, showing a significant decrease in cell viability	Antioxidants (Basel). 2021 Jul 23;10(8):1171
Human blood cells	25 μg/mL	24 hours	Evaluate the cytotoxic effect of usnic acid on human blood cells, showing a slight decrease in cell viability	Antioxidants (Basel). 2021 Jul 23;10(8):1171
Mycobacterium tuberculosis H37Ra	512 μg/ml	24 hours	To evaluate the effect of usnic acid on Mycobacterium tuberculosis at transcriptomic and metabolomic levels, results showed that usnic acid treatment provoked disturbances of redox state in mycobacterial cells and increased production of structural elements of the cell wall and cell membrane	mSystems. 2021 May 4;6(3):e00097-21
Calu-1 cells	10 to 40 µM	24 hours	Usnic acid dose-dependently induced apoptosis in Calu-1 cells	Int J Mol Sci. 2020 Jan 29;21(3):876
H520 cells	10 to 40 µM	24 hours	Usnic acid dose-dependently induced apoptosis in H520 cells	Int J Mol Sci. 2020 Jan 29;21(3):876
HepG2 cells	3.13-50 µM	24 hours	To investigate the toxic effects of usnic acid on HepG2 cells, including DNA damage, S-phase cell cycle arrest, and oxidative stress. Results showed that usnic acid caused DNA damage and S-phase cell cycle arrest within 24 hours and triggered oxidative stress.	Arch Toxicol. 2017 Mar;91(3):1293-1307
Yeast cells	40 µM	2-5 minutes	To observe the effect of Usnic acid on nuclear accumulation of Rpl7a-GFP, results showed Rpl7a-GFP accumulated in the nucleus within 2 minutes.	Nat Commun. 2024 Aug 29;15(1):7511
HNEpC cells	75 mcg/mL	3 hours	Evaluate the blocking effect of UA on VSV-based pseudovirus SARS-CoV-2 infection, results showed UA effectively blocked viral infection.	Int J Mol Sci. 2023 Feb 12;24(4):3695
Vero E6 cells	75 mcg/mL	3 hours	Evaluate the blocking effect of UA on VSV-based pseudovirus SARS-CoV-2 infection, results showed UA effectively blocked viral infection.	Int J Mol Sci. 2023 Feb 12;24(4):3695
Yeast cells	40 µM	30 minutes	To observe the effect of Usnic acid on nucleolar accumulation of Rps9-GFP, results showed Rps9-GFP accumulated in the nucleolus within 30 minutes.	Nat Commun. 2024 Aug 29;15(1):7511
Coccidian oocysts	30 µM	8 hours	Induced apoptosis in coccidian oocysts, lowered mitochondrial membrane potential, and disrupted oocyst structure	J Anim Sci Biotechnol. 2025 May 12;16(1):67

Caenorhabditis elegans	Wild-type animals and various mutants	Administered via culture medium	2 mM	Continuous administration starting from L4 larval stage	Usnic Acid extended healthspan and improved neurodegeneration diseases by inhibiting the mTOR/PHA-4 signaling pathway	iScience. 2022 Nov 9;25(12):105539
Broiler chickens	Necrotic enteritis model	Oral	300 mg/kg	Once daily for 42 days	Improved growth performance, reduced intestinal lesion scores, decreased fecal coccidian oocyst counts, and enhanced intestinal barrier function and immune response	J Anim Sci Biotechnol. 2025 May 12;16(1):67
Female nude mice	H520 xenograft model	Intraperitoneal injection	50 mg/kg	Once every two days for four weeks	Usnic acid significantly inhibited H520 xenograft tumor growth	Int J Mol Sci. 2020 Jan 29;21(3):876

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CAS No.: 125-46-2

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CAS No.: 125-46-2

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Precautionary Statements-General
Code	Phrase
P101	If medical advice is needed,have product container or label at hand.
P102	Keep out of reach of children.
P103	Read label before use
Prevention
Code	Phrase
P201	Obtain special instructions before use.
P202	Do not handle until all safety precautions have been read and understood.
P210	Keep away from heat/sparks/open flames/hot surfaces. - No smoking.
P211	Do not spray on an open flame or other ignition source.
P220	Keep/Store away from clothing/combustible materials.
P221	Take any precaution to avoid mixing with combustibles
P222	Do not allow contact with air.
P223	Keep away from any possible contact with water, because of violent reaction and possible flash fire.
P230	Keep wetted
P231	Handle under inert gas.
P232	Protect from moisture.
P233	Keep container tightly closed.
P234	Keep only in original container.
P235	Keep cool
P240	Ground/bond container and receiving equipment.
P241	Use explosion-proof electrical/ventilating/lighting/equipment.
P242	Use only non-sparking tools.
P243	Take precautionary measures against static discharge.
P244	Keep reduction valves free from grease and oil.
P250	Do not subject to grinding/shock/friction.
P251	Pressurized container: Do not pierce or burn, even after use.
P260	Do not breathe dust/fume/gas/mist/vapours/spray.
P261	Avoid breathing dust/fume/gas/mist/vapours/spray.
P262	Do not get in eyes, on skin, or on clothing.
P263	Avoid contact during pregnancy/while nursing.
P264	Wash hands thoroughly after handling.
P265	Wash skin thouroughly after handling.
P270	Do not eat, drink or smoke when using this product.
P271	Use only outdoors or in a well-ventilated area.
P272	Contaminated work clothing should not be allowed out of the workplace.
P273	Avoid release to the environment.
P280	Wear protective gloves/protective clothing/eye protection/face protection.
P281	Use personal protective equipment as required.
P282	Wear cold insulating gloves/face shield/eye protection.
P283	Wear fire/flame resistant/retardant clothing.
P284	Wear respiratory protection.
P285	In case of inadequate ventilation wear respiratory protection.
P231 + P232	Handle under inert gas. Protect from moisture.
P235 + P410	Keep cool. Protect from sunlight.
Response
Code	Phrase
P301	IF SWALLOWED:
P304	IF INHALED:
P305	IF IN EYES:
P306	IF ON CLOTHING:
P307	IF exposed:
P308	IF exposed or concerned:
P309	IF exposed or if you feel unwell:
P310	Immediately call a POISON CENTER or doctor/physician.
P311	Call a POISON CENTER or doctor/physician.
P312	Call a POISON CENTER or doctor/physician if you feel unwell.
P313	Get medical advice/attention.
P314	Get medical advice/attention if you feel unwell.
P315	Get immediate medical advice/attention.
P320
P302 + P352	IF ON SKIN: wash with plenty of soap and water.
P321
P322
P330	Rinse mouth.
P331	Do NOT induce vomiting.
P332	IF SKIN irritation occurs:
P333	If skin irritation or rash occurs:
P334	Immerse in cool water/wrap n wet bandages.
P335	Brush off loose particles from skin.
P336	Thaw frosted parts with lukewarm water. Do not rub affected area.
P337	If eye irritation persists:
P338	Remove contact lenses, if present and easy to do. Continue rinsing.
P340	Remove victim to fresh air and keep at rest in a position comfortable for breathing.
P341	If breathing is difficult, remove victim to fresh air and keep at rest in a position comfortable for breathing.
P342	If experiencing respiratory symptoms:
P350	Gently wash with plenty of soap and water.
P351	Rinse cautiously with water for several minutes.
P352	Wash with plenty of soap and water.
P353	Rinse skin with water/shower.
P360	Rinse immediately contaminated clothing and skin with plenty of water before removing clothes.
P361	Remove/Take off immediately all contaminated clothing.
P362	Take off contaminated clothing and wash before reuse.
P363	Wash contaminated clothing before reuse.
P370	In case of fire:
P371	In case of major fire and large quantities:
P372	Explosion risk in case of fire.
P373	DO NOT fight fire when fire reaches explosives.
P374	Fight fire with normal precautions from a reasonable distance.
P376	Stop leak if safe to do so. Oxidising gases (section 2.4) 1
P377	Leaking gas fire: Do not extinguish, unless leak can be stopped safely.
P378
P380	Evacuate area.
P381	Eliminate all ignition sources if safe to do so.
P390	Absorb spillage to prevent material damage.
P391	Collect spillage. Hazardous to the aquatic environment
P301 + P310	IF SWALLOWED: Immediately call a POISON CENTER or doctor/physician.
P301 + P312	IF SWALLOWED: call a POISON CENTER or doctor/physician IF you feel unwell.
P301 + P330 + P331	IF SWALLOWED: Rinse mouth. Do NOT induce vomiting.
P302 + P334	IF ON SKIN: Immerse in cool water/wrap in wet bandages.
P302 + P350	IF ON SKIN: Gently wash with plenty of soap and water.
P303 + P361 + P353	IF ON SKIN (or hair): Remove/Take off Immediately all contaminated clothing. Rinse SKIN with water/shower.
P304 + P312	IF INHALED: Call a POISON CENTER or doctor/physician if you feel unwell.
P304 + P340	IF INHALED: Remove victim to fresh air and Keep at rest in a position comfortable for breathing.
P304 + P341	IF INHALED: If breathing is difficult, remove victim to fresh air and keep at rest in a position comfortable for breathing.
P305 + P351 + P338	IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
P306 + P360	IF ON CLOTHING: Rinse Immediately contaminated CLOTHING and SKIN with plenty of water before removing clothes.
P307 + P311	IF exposed: call a POISON CENTER or doctor/physician.
P308 + P313	IF exposed or concerned: Get medical advice/attention.
P309 + P311	IF exposed or if you feel unwell: call a POISON CENTER or doctor/physician.
P332 + P313	IF SKIN irritation occurs: Get medical advice/attention.
P333 + P313	IF SKIN irritation or rash occurs: Get medical advice/attention.
P335 + P334	Brush off loose particles from skin. Immerse in cool water/wrap in wet bandages.
P337 + P313	IF eye irritation persists: Get medical advice/attention.
P342 + P311	IF experiencing respiratory symptoms: call a POISON CENTER or doctor/physician.
P370 + P376	In case of fire: Stop leak if safe to Do so.
P370 + P378	In case of fire:
P370 + P380	In case of fire: Evacuate area.
P370 + P380 + P375	In case of fire: Evacuate area. Fight fire remotely due to the risk of explosion.
P371 + P380 + P375	In case of major fire and large quantities: Evacuate area. Fight fire remotely due to the risk of explosion.
Storage
Code	Phrase
P401
P402	Store in a dry place.
P403	Store in a well-ventilated place.
P404	Store in a closed container.
P405	Store locked up.
P406	Store in corrosive resistant/ container with a resistant inner liner.
P407	Maintain air gap between stacks/pallets.
P410	Protect from sunlight.
P411
P412	Do not expose to temperatures exceeding 50 oC/ 122 oF.
P413
P420	Store away from other materials.
P422
P402 + P404	Store in a dry place. Store in a closed container.
P403 + P233	Store in a well-ventilated place. Keep container tightly closed.
P403 + P235	Store in a well-ventilated place. Keep cool.
P410 + P403	Protect from sunlight. Store in a well-ventilated place.
P410 + P412	Protect from sunlight. Do not expose to temperatures exceeding 50 oC/122oF.
P411 + P235	Keep cool.
Disposal
Code	Phrase
P501	Dispose of contents/container to ...
P502	Refer to manufacturer/supplier for information on recovery/recycling

Physical hazards
Code	Phrase
H200	Unstable explosive
H201	Explosive; mass explosion hazard
H202	Explosive; severe projection hazard
H203	Explosive; fire, blast or projection hazard
H204	Fire or projection hazard
H205	May mass explode in fire
H220	Extremely flammable gas
H221	Flammable gas
H222	Extremely flammable aerosol
H223	Flammable aerosol
H224	Extremely flammable liquid and vapour
H225	Highly flammable liquid and vapour
H226	Flammable liquid and vapour
H227	Combustible liquid
H228	Flammable solid
H229	Pressurized container: may burst if heated
H230	May react explosively even in the absence of air
H231	May react explosively even in the absence of air at elevated pressure and/or temperature
H240	Heating may cause an explosion
H241	Heating may cause a fire or explosion
H242	Heating may cause a fire
H250	Catches fire spontaneously if exposed to air
H251	Self-heating; may catch fire
H252	Self-heating in large quantities; may catch fire
H260	In contact with water releases flammable gases which may ignite spontaneously
H261	In contact with water releases flammable gas
H270	May cause or intensify fire; oxidizer
H271	May cause fire or explosion; strong oxidizer
H272	May intensify fire; oxidizer
H280	Contains gas under pressure; may explode if heated
H281	Contains refrigerated gas; may cause cryogenic burns or injury
H290	May be corrosive to metals
Health hazards
Code	Phrase
H300	Fatal if swallowed
H301	Toxic if swallowed
H302	Harmful if swallowed
H303	May be harmful if swallowed