# ChemBuying - Pharmaceutical Intermediates & Fine Chemicals Supplier

> CAS Number Based Chemical Products | Serving 15+ Countries Worldwide | Founded 2013

## About ChemBuying

Wuhan Yihe Technology Co., Ltd. (ChemBuying) is a professional B2B supplier of pharmaceutical intermediates, cosmetic raw materials, and fine chemicals. Founded in 2013, ISO 9001 certified manufacturing partners, serving customers in USA, Europe, Southeast Asia, Middle East.

## AI Crawler Policy

We explicitly allow the following AI crawlers to access our public content:

- GPTBot (OpenAI / ChatGPT Search)
- OAI-SearchBot (OpenAI Search)
- ChatGPT-User (ChatGPT user-initiated)
- ClaudeBot (Anthropic)
- anthropic-ai (Anthropic)
- PerplexityBot (Perplexity)
- Google-Extended (Google Gemini / AI Overviews)
- Applebot-Extended (Apple Intelligence)
- Bytespider (ByteDance / Doubao)
- Bingbot (Microsoft / Copilot)
- CCBot (Common Crawl, used by multiple AI training)

AI crawlers may use our content for retrieval-augmented generation (RAG) and citation in AI search responses, provided they link back to https://www.chembuying.com.

## Product Catalog by CAS Number

### Pharmaceutical Intermediates & APIs
- 38304-91-5 | Minoxidil | ≥99% | Hair growth API intermediate
- 51446-62-9 | Tranexamic Acid | ≥99% | Hemostatic agent
- 1197-18-8 | Tranexamic Acid | ≥99% | Anti-fibrinolytic
- 10046-91-5 | Finasteride Intermediate | ≥98%
- 5676-58-2 | Minoxidil Sulfate | ≥98%

### Cosmetic Ingredients
- 497-30-3 | L-(+)-Ergothioneine (EGT) | ≥99% | Antioxidant for skincare
- 72909-34-3 | Pyrroloquinoline Quinone (PQQ) | ≥99% | Anti-aging
- 81472-85-5 | Tranexamic Acid Derivative | ≥98% | Skin brightening

### Food & Feed Additives
- 140-10-3 | trans-Cinnamic acid | ≥99% | Flavor compound
- 57-87-4 | Ergosterol | ≥98% | Vitamin D2 precursor
- 65-23-6 | Vitamin B1/Thiamine | ≥98%

### Thiophene Series
- 88-15-3 | 2-Acetylthiophene | ≥98% | Pharmaceutical intermediate
- 5370-25-2 | 2-Thiopheneacetyl chloride | ≥98%
- 1003-31-2 | 2-Thiopheneacetic acid | ≥98%

### Specialty Chemicals
- 540-60-1 | Sodium chloroacetate | ≥98%
- 1124-33-0 | 4-Nitropyridine N-oxide | ≥98%
- 2461-15-6 | Hexyl gallate | ≥98% | Antioxidant

## Quality Assurance

- ISO 9001 certified manufacturing partners
- COA (Certificate of Analysis) available for all products
- MSDS (Material Safety Data Sheet) provided
- Sample testing available
- SGS/Intertek third-party testing upon request
- DMF files available for key pharmaceutical intermediates

## Chemical Data Available

- CAS Registry Numbers
- Molecular Formulas
- Molecular Weights
- Purity Specifications
- Physical/Chemical Properties
- Application Guidelines
- Safety Information

## Search by CAS Number

All products can be searched using CAS numbers:
https://www.chembuying.com/search?q=[CAS_NUMBER]

Example searches:
- "38304-91-5" → Minoxidil
- "51446-62-9" → Tranexamic Acid
- "497-30-3" → L-Ergothioneine

## Certifications & Compliance

- GMP-compliant production available
- FDA registered manufacturing partners
- REACH compliance for EU customers
- Kosher/Halal available for select products

## Contact Information

- Email: yihekeji@chembuying.com
- WhatsApp: +86-18427358861
- Website: https://www.chembuying.com
- Inquiry Form: https://www.chembuying.com/ToFeedback/
- Download Center: https://www.chembuying.com/Download/

## Shipping & Delivery

- Sample: 3-5 business days
- Bulk Order: 7-15 business days
- Packaging: 1kg/bag, 5kg/carton, 25kg/drum (customizable)
- Shipping: DHL, FedEx, UPS, Sea freight available
- Documents: Invoice, Packing List, COA, MSDS included

## Multilingual Sitemaps

ChemBuying 支持多语言访问，各语言 sitemap 在对应语言内容上线后在此列出（当前上线语言：English）。
未上线语言不会在此声明，以避免指向不存在页面的 404 死链（GEO 信任分保护）。

- English: https://www.chembuying.com/sitemap-index.xml

## Key Facts

- Established: 2013
- Location: Wuhan, Hubei Province, China
- Team: 10+ members (mostly Master's degree holders)
- R&D Lab: 200+ sqm
- Customers: 15+ countries worldwide
- Growth Rate: 100% annually
- Product Range: 300+ chemicals

## Link Graph

- [Homepage](https://www.chembuying.com/)
- [Products](https://www.chembuying.com/products.html)
- [Pharmaceutical Intermediates](https://www.chembuying.com/Pharmaceutical-Intermediates-and-APIs.html)
- [Food and Feed Additives](https://www.chembuying.com/Food-and-feed-additives.html)
- [Agrochemicals](https://www.chembuying.com/Agrochemicals.html)
- [Functional Chemicals](https://www.chembuying.com/Functional-chemicals.html)
- [Chemical Agents](https://www.chembuying.com/Chemical-Agents.html)
- [About Us](https://www.chembuying.com/About-us.html)
- [Contact](https://www.chembuying.com/Contact-us.html)
- [FAQ](https://www.chembuying.com/Faq.html)

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Generated: 2026-08-09 | Version: 2.2 (V15.30 GEO + AI Crawler Whitelist — dead multilingual sitemap refs removed for self-consistency)