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2. PubChem

   pubchem.ncbi.nlm.nih.gov

   Search and explore chemical information in the world's largest free chemistry database. Search chemicals by name, molecular formula, structure, and other identifiers. Find chemical and physical properties, biological activities, safety and toxicity information, patents, literature citations and more.

3. Classification Browser - PubChem

   pubchem.ncbi.nlm.nih.gov/classification

   Browse PubChem data using a classification of interest, or search for PubChem records annotated with the desired classification/term (e.g., MeSH: phenylpropionates, or Gene Ontology: DNA repair).

4. Data Sources - PubChem

   pubchem.ncbi.nlm.nih.gov/sources

   Browse PubChem data sources by country, type of data provided or category such as chemical vendors/suppliers, government organizations, journal publishers, and more.

5. Docs - PubChem

   pubchem.ncbi.nlm.nih.gov/docs

   PubChem Substance is the primary archive for community-provided information about chemical entities. A Substance record can contain chemical structures, synonyms, registration IDs, descriptions, related URLs, patent identifiers, cross-references to PubMed, and biological screening results, etc.

6. Meldrum's acid | C6H8O4 | CID 16249 - PubChem

   pubchem.ncbi.nlm.nih.gov/compound/Meldrum_s-acid

   Meldrum's acid | C6H8O4 | CID 16249 - structure, chemical names, physical and chemical properties, classification, patents, literature, biological activities, safety/hazards/toxicity information, supplier lists, and more.

7. Substances - PubChem

   pubchem.ncbi.nlm.nih.gov/docs/substances

   PubChem Substance is the primary archive for community-provided information about chemical entities. A Substance record can contain chemical structures, synonyms, registration IDs, descriptions, related URLs, patent identifiers, cross-references to PubMed, and biological screening results, etc.

8. Gasoline - PubChem

   pubchem.ncbi.nlm.nih.gov/compound/Gasoline

   Gasoline is a complex mixture of volatile hydrocarbons (paraffins, cycloparaffins, and aromatics. [NIOSH] U.S. gasoline contains about 1% benzene and about 1% n-hexane. Gasoline additives include organic lead, ethylene dibromide, ethanol, methanol, methyl tertiary butyl ether (MTBE), and tertiary butyl ether (TBE).

9. Allura Red AC | C18H14N2Na2O8S2 | CID 33258 - PubChem

   pubchem.ncbi.nlm.nih.gov/compound/Allura-Red-AC

   Allura Red AC | C18H14N2Na2O8S2 | CID 33258 - structure, chemical names, physical and chemical properties, classification, patents, literature, biological activities, safety/hazards/toxicity information, supplier lists, and more.

10. Water | H2O | CID 962 - PubChem

    pubchem.ncbi.nlm.nih.gov/compound/water

    Water (chemical formula: H2O) is a transparent fluid which forms the world's streams, lakes, oceans and rain, and is the major constituent of the fluids of organisms. As a chemical compound, a water molecule contains one oxygen and two hydrogen atoms that are connected by covalent bonds.

11. Peroxydisulfate | O8S2-2 | CID 107879 - PubChem

    pubchem.ncbi.nlm.nih.gov/compound/Peroxydisulfate

    Peroxydisulfate | O8S2-2 | CID 107879 - structure, chemical names, physical and chemical properties, classification, patents, literature, biological activities, safety/hazards/toxicity information, supplier lists, and more.