chem-block.com valid
ChemBlock
ChemBlock is an online catalog of fine and specialty chemicals for laboratory research and bulk production.
For agents: ChemBlock: online catalog of fine and specialty chemicals for lab research and bulk production, with quotations and custom synthesis inquiries.
fine chemicalsspecialty chemicalsquinazolinecustom synthesislaboratory supplies
- Authority
- 47 reach 6 · trust 5 · quality 21 · freshness 15
- Tier
- listed
- llms.txt
- https://chem-block.com/llms.txt
- Sections
- 3
- Links
- 42
- Size
- 5075 bytes
- Popularity rank
- #624185
- Country
- United States
- Categories
- Ecommerce · Science and research
- For agents
- Transactional: buying or booking an agent could carry out
- Inferred actions
- Search content Buy products About these labels
- Audience
- business · agents can: search content, buy · en
- First seen
- 2026-10-19T10:41:08.245Z
- Last checked
- 2026-10-20T03:20:57.930Z
- Badge
Their llms.txt
The beginning of the file, from our validated copy saved 2026-10-21T20:25:26.708Z. Cached copy · Source on chem-block.com
# ChemBlock
> ChemBlock is an online catalog of fine and specialty chemicals for laboratory research and bulk production.
Every product page is identified by its CAS Registry Number and lists the chemical name, molecular formula, identifiers and synonyms where available. Prices and lead times are quoted on request; the catalog lists 40,400+ compounds.
## Site
- [Home](https://chem-block.com/): featured products and categories
- [About](https://chem-block.com/about): about ChemBlock
- [Contact](https://chem-block.com/contact): inquiries, quotations and custom synthesis
- [Sitemap](https://chem-block.com/sitemap.xml): complete list of product pages
## Product categories
- [(1,2-c)quinazoline](https://chem-block.com/product/category?catId=7640&pageNumber=1)
- [(2,1-b)Quinazolin](https://chem-block.com/product/category?catId=8140&pageNumber=1)
- [(4,5-g)quinazolin](https://chem-block.com/product/category?catId=9610&pageNumber=1)
- [(5,1-b)quinazoline](https://chem-block.com/product/category?catId=9700&pageNumber=1)
- [Cyclohexanone](https://chem-block.com/product/category?catId=11540&pageNumber=1)
- [Hexanone](https://chem-block.com/product/category?catId=29850&pageNumber=1)
- [Quinazoline](https://chem-block.com/product/category?catId=32340&pageNumber=1)
- [Benzo Quinazoline](https://chem-block.com/product/category?catId=34910&pageNumber=1)
- [Quinazolinone](https://chem-block.com/product/category?catId=35440&pageNumber=1)
- [Hexane](https://chem-block.com/product/category?catId=36026&pageNumber=1)
- [CycloHexane](https://chem-block.com/product/category?catId=36125&pageNumber=1)
- [CycloHexane,](https://chem-block.com/product/category?catId=36130&pageNumber=1)
- [Hexanediol](https://chem-block.com/product/category?catId=51050&pageNumber=1)
- [Cyclohexanediol](https://chem-block.com/product/category?catId=51100&pageNumber=1)
- [()Quinazoline](https://chem-block.com/product/category?catId=58450&pageNumber=1)
- [Quinazoline](https://chem-block.com/product/category?catId=58880&pageNumber=1)
- [Quinazolinol](https://chem-block.com/product/category?catId=59600&pageNumber=1)
- [ChloroQuinazolin](https://chem-block.com/product/category?catId=60440&pageNumber=1)
## Example products
- [(2R,4R)-4-amino-1-(tert-butoxycarbonyl)pyrrolidine-2-carboxylic acid (CAS 1362622-69-6)](https://chem-block.com/products/1362622-69-6-2r-4r-4-amino-1-tert-butoxycarbonyl-pyrrolidine-2-carboxylic-acid)
- [Tiopronin (CAS 953-02-2)](https://chem-block.com/products/953-02-2-tiopronin)
- [4-methoxybenzoic acid (CAS 73424-02-9)](https://chem-block.com/products/73424-02-9-4-methoxybenzoic-acid)
- [1-VINYL-(CIS-1,2-BIS(4,4,5,5-TETRAMETHYL-1,3,2-DIOXABOROLAN-2-YL))CYCLOHEXAN-1-OL (CAS 264144-69-6)](https://chem-block.com/products/264144-69-6-1-vinyl-cis-1-2-bis-4-4-5-5-tetramethyl-1-3-2-dioxaborolan-2-yl-cyclohexan-1-ol)
- [PYRIDIN-2-YLMETHYL-(TETRAHYDRO-FURAN-2-YLMETHYL)-AMINE (CAS 202199-02-8)](https://chem-block.com/products/202199-02-8-pyrid
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