PubChem

Chemical details and chemical safety data

PubChem provides compound facts and structures, plus available hazard labels, first aid, flash points, and workplace exposure limits; some fields may be unavailable.

Get chemical

Get a chemical’s formula, molecular weight, names, description, and structure image from its common name or CAS number. Descriptions and CAS numbers may be unavailable for some compounds.

Your information

Chemical

Common chemical name or CAS number, for example caffeine or 58-08-2.

1 credit per completed run

The same inputs also work from your code or an AI assistant. See For developers.

Example results

Acetone

Molecular formulaC3H6O

Molecular weight58.08grams per mole

Acetone is a methyl ketone that consists of propane bearing an oxo group at C2.

CAS number: 67-64-1
IUPAC name: propan-2-one

Other names

2-propanone
propanone
propan-2-one
Dimethyl ketone
Pyroacetic ether
Methyl ketone
Dimethylformaldehyde
beta-Ketopropane
Dimethylketal
Chevron acetone

View on PubChem

About the PubChem tool

Get chemical returns compound names, identifiers, formula, weight, description, and structure image for a common name or CAS number.

Get chemical safety returns reported hazards, first aid, flash point, and exposure limits for a chemical name or CAS number.

Built from pubchem.ncbi.nlm.nih.gov. Last checked Sep 29, 2026.

Actions

Get chemical

1 credit

Get a chemical’s formula, molecular weight, names, description, and structure image from its common name or CAS number. Descriptions and CAS numbers may be unavailable for some compounds.

What you provide

Field	Type	Required	Description
Chemical`chemical`	Text	Required	Common chemical name or CAS number, for example caffeine or 58-08-2.Example: Acetone

What you get

Field	Type	Description
Name`name`	Text	Compound name.Example: Acetone
Smiles`smiles`	Text	SMILES molecular structure.Example: CC(=O)C
Inchikey`inchikey`	Text	InChIKey structure identifier.Example: CSCPPACGZOOCGX-UHFFFAOYSA-N
Cas Number`cas_number`	Text	CAS registry number if listed among PubChem synonyms.Example: 67-64-1
Iupac Name`iupac_name`	Text	IUPAC chemical name.Example: Propan 2 one
Description`description`	Text	Brief plain-text description.Example: Acetone is a methyl ketone that consists of propane bearing an oxo group at C2.
Pubchem Cid`pubchem_cid`	Number	PubChem compound ID.Example: 180
Pubchem URL`pubchem_url`	Text	PubChem compound page.Example: https://pubchem.ncbi.nlm.nih.gov/compound/180
Common Synonyms`common_synonyms`	List	Up to ten other names for the chemical.
Molecular Formula`molecular_formula`	Text	Molecular formula.Example: C3H6O
Structure Image URL`structure_image_url`	Text	2D chemical structure PNG link.Example: https://pubchem.ncbi.nlm.nih.gov/rest/pug/compound/cid/180/PNG?record_type=2d
Molecular Weight G Per Mol`molecular_weight_g_per_mol`	Number	Molecular weight in grams per mole.Example: 58.08

Example result

For Chemical: Acetone

JSON

{
  "name": "Acetone",
  "smiles": "CC(=O)C",
  "inchikey": "CSCPPACGZOOCGX-UHFFFAOYSA-N",
  "cas_number": "67-64-1",
  "iupac_name": "propan-2-one",
  "description": "Acetone is a methyl ketone that consists of propane bearing an oxo group at C2.",
  "pubchem_cid": 180,
  "pubchem_url": "https://pubchem.ncbi.nlm.nih.gov/compound/180",
  "common_synonyms": [
    "2-propanone",
    "propanone",
    "propan-2-one"
  ],
  "molecular_formula": "C3H6O",
  "structure_image_url": "https://pubchem.ncbi.nlm.nih.gov/rest/pug/compound/cid/180/PNG?record_type=2d",
  "molecular_weight_g_per_mol": 58.08
}

Get chemical safety

1 credit

Get PubChem hazard labels, route-specific first aid, flash point, and workplace exposure limits for a chemical name or CAS number. Fields absent from the compound record are null; common product names may resolve to their underlying compound, which is identified by its returned name.

What you provide

Field	Type	Required	Description
Chemical`chemical`	Text	Required	Common chemical name or CAS number, for example acetone, bleach, or 67-64-1.Example: Acetone

What you get

Field	Type	Description
Name`name`	Text	PubChem name of the matched compound.Example: Acetone
First Aid`first_aid`	Details
Eyes`first_aid.eyes`	Text	Example: Rinse with plenty of water (remove contact lenses if easily possible). Refer…
Skin`first_aid.skin`	Text	Example: Remove contaminated clothes. Rinse skin with plenty of water or shower.
Swallowing`first_aid.swallowing`	Text	Example: Rinse mouth. Do NOT induce vomiting. Refer for medical attention .
Breathing in`first_aid.breathing_in`	Text	Example: Fresh air, rest. Refer for medical attention.
Flash Point`flash_point`	Text	Reported flash point with units.Example: 0 °F (NTP, 1992)
Signal Word`signal_word`	Text	GHS signal word, Danger or Warning, when reported.Example: Danger
Ghs Hazard Codes`ghs_hazard_codes`	List	GHS H-codes corresponding to the hazard statements.
Hazard Pictograms`hazard_pictograms`	List	GHS pictogram names and images.
Name`hazard_pictograms[].name`	Text	Example: Flammable
Image Link`hazard_pictograms[].image_link`	Text	Example: https://pubchem.ncbi.nlm.nih.gov/images/ghs/GHS02.svg
Hazard Statements`hazard_statements`	List	GHS hazards in plain words.
Pubchem Compound ID`pubchem_compound_id`	Number	PubChem compound ID.Example: 180
Safety Section Link`safety_section_link`	Text	PubChem Safety and Hazards section.Example: https://pubchem.ncbi.nlm.nih.gov/compound/180#section=Safety-and-Hazards
Workplace Exposure Limits`workplace_exposure_limits`	Text	Reported OSHA or other workplace exposure limits with units.Example: OSHA: Permissible Exposure Limit: Table Z-1 8-hr Time Weighted Avg: 1000 ppm…

Example result

For Chemical: Acetone

JSON

{
  "name": "Acetone",
  "first_aid": {
    "eyes": "Rinse with plenty of water (remove contact lenses if easily possible). Refer for medical attention.",
    "skin": "Remove contaminated clothes. Rinse skin with plenty of water or shower.",
    "swallowing": "Rinse mouth. Do NOT induce vomiting. Refer for medical attention .",
    "breathing_in": "Fresh air, rest. Refer for medical attention."
  },
  "flash_point": "0 °F (NTP, 1992)",
  "signal_word": "Danger",
  "ghs_hazard_codes": [
    "H225",
    "H319",
    "H336"
  ],
  "hazard_pictograms": [
    {
      "name": "Flammable",
      "image_link": "https://pubchem.ncbi.nlm.nih.gov/images/ghs/GHS02.svg"
    },
    {
      "name": "Irritant",
      "image_link": "https://pubchem.ncbi.nlm.nih.gov/images/ghs/GHS07.svg"
    }
  ],
  "hazard_statements": [
    "Highly Flammable liquid and vapor",
    "Causes serious eye irritation",
    "May cause drowsiness or dizziness"
  ],
  "pubchem_compound_id": 180,
  "safety_section_link": "https://pubchem.ncbi.nlm.nih.gov/compound/180#section=Safety-and-Hazards",
  "workplace_exposure_limits": "OSHA: Permissible Exposure Limit: Table Z-1 8-hr Time Weighted Avg: 1000 ppm (2400 mg/cu m).; OSHA: Vacated 1989 OSHA PEL TWA 750 ppm (1800 mg/cu m); STEL 1000 ppm (2400 mg/cu m) is still enforced in …"
}

For developers

Call it from your code with one request. Change the values in input to run it on new data. To get an API key, open Developers at the bottom of Studio, turn on Developer mode and go to API keys.

cURL

curl 'https://api.fous.com/v1/query' \
  --fail-with-body --silent --show-error --max-time 180 \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H 'Content-Type: application/json' \
  --data-raw '{
  "api": "@pubchem",
  "visibility": "public",
  "operation": "get_chemical",
  "version": 1,
  "input": {
    "chemical": "acetone"
  },
  "response": {
    "format": "json"
  }
}'

What you can do with it

Look up a compound’s formula and molecular weight.
Compare chemical names and structure identifiers.
Review reported hazard labels and pictograms.
Find first-aid guidance by exposure route.
Check reported flash points and workplace exposure limits.

Questions about PubChem

Can I run it with my own inputs?

Yes. Change the inputs in Studio and press Run, or send new inputs from your code, or ask a connected AI assistant.

Can I call this PubChem tool as an API?

Yes. Send a POST request to /v1/query with your Fous API key and the inputs, and get JSON back.

How much does it cost?

Each completed run costs 1 credit. Failed runs without a completed receipt are free; completed work can remain charged if delivery is interrupted. With pay as you go, a credit costs 1¢. Monthly plans cost less per credit.

Do I need a PubChem account?

No. You only need a Fous account.

How current is the data?

Fous gets the data from pubchem.ncbi.nlm.nih.gov when you run it. Some results are reused for up to 24 hours, and results that use your account or key are never reused. It was last verified on Sep 29, 2026.