4-Methylthiazole-5-carboxylic acid
4-Methylthiazole-5-carboxylic acid (CAS: 20485-41-0), with the molecular formula C5H5NO2S and a molecular weight of 143.16 g/mol, is a heterocyclic organic compound. It serves as a valuable building block in chemical synthesis, particularly within the realm of thiazole derivatives. Its structure makes it suitable for incorporation into more complex molecules, finding utility in research and development settings for the creation of novel compounds.
- IUPAC
- 4-Methyl-1,3-thiazole-5-carboxylic acid
- Synonyms
- 4-Methyl-1,3-thiazole-5-carboxylic acid

Chemical Synthesis Intermediate
4-Methylthiazole-5-carboxylic acid is employed as a key intermediate in the synthesis of various organic compounds. Its thiazole core and carboxylic acid functional group allow for diverse chemical transformations.
Heterocyclic Building Block
As a heterocyclic building block, this compound is utilised in the construction of complex molecular architectures. Its inclusion is often crucial in the development of new chemical entities in research laboratories.
Research and Development
This chemical is used in R&D settings for the exploration of new synthetic pathways and the development of novel materials or active pharmaceutical ingredients.
| Molecular weight | 143.16 |
|---|---|
| Empirical formula | C5H5NO2S |
| Assay | 97% |
| Melting point | 287 °C (dec.)(lit.) |

Hazard statements
- H317May cause an allergic skin reaction
Precautionary statements
- P280Wear protective gloves, clothing and eye/face protection
| Protective equipment | dust mask type N95 (US), Eyeshields, Faceshields, Gloves |
|---|---|
| Water hazard class (WGK, DE) | 3 |
| Hazard codes (EU) | Xi |
| Risk statements (R) | 43 |
| Safety statements (S) | 37/39 |
Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.
Documentation
Every batch ships with a Certificate of Analysis covering assay, identity and purity; the grade is confirmed against your enquiry. Safety Data Sheets and technical data sheets are available on request.
Supply & logistics
Samples for technical evaluation; bulk MOQ by grade and packaging. In-stock material ships in 7–10 working days, worldwide, with full export documentation.
What is 4-Methylthiazole-5-carboxylic acid used for?
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4-Methylthiazole-5-carboxylic acid is used as a building block in chemical synthesis and in research and development for creating novel heterocyclic compounds.
What is the CAS number and chemical formula for 4-Methylthiazole-5-carboxylic acid?
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The CAS number is 20485-41-0 and the chemical formula is C5H5NO2S.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies 4-Methylthiazole-5-carboxylic acid with an assay of 97%. We do not represent this product as USP, BP, or EP grade.
How should 4-Methylthiazole-5-carboxylic acid be handled safely?
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Handle with appropriate personal protective equipment, including a dust mask type N95 (US), eyeshields, faceshields, and gloves, as it may cause an allergic skin reaction (H317).
Is 4-Methylthiazole-5-carboxylic acid available for export?
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Yes, Tech Serve Solutions is a global supplier and exporter of fine chemicals, including 4-Methylthiazole-5-carboxylic acid.
How can I request a quote or sample?
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Please contact our sales team through the website or by phone to request a quote or sample of 4-Methylthiazole-5-carboxylic acid.
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