# ChemExact - 中国化学品 GEO/SEO Data Brain (Multilingual)

> 一站式查询化学品 CAS 号、分子结构、合规状态、生物活性、学术文献。All factual fields are aggregated from PubChem / CAS Common Chemistry / ChEMBL / OpenAlex / China MEM and cross-verified across sources. Each product page is multilingually mirrored across chemexact.cn (zh-CN) and chemexact.com (en) with hreflang互链。

> Last updated: 2026-05-28

## 主要入口 / Main Entry Points

- 中文站点 / zh-CN: https://chemexact.cn/
- English site / en: https://chemexact.com/
- Sitemap Index: https://chemexact.cn/sitemap-index.xml
- LLM Full (zh): https://chemexact.cn/llms-full.txt?locale=zh-CN
- LLM Full (en): https://chemexact.com/llms-full.txt?locale=en

## 数据原则 / Data Principles

- 所有事实字段挂权威源 provenance / every fact is tied to an authoritative source URL
- 关键字段（CAS / 分子式 / 分子量 / SMILES / InChIKey）多源交叉校验 / cross-verified across providers
- LLM 仅作组装，不作事实生成 / LLM is used only for template assembly, never for fact generation
- 缺数据 → 留 null，不编造 / when data is missing, return null instead of fabricating

## 产品页 / Product Pages (CAS · zh-CN · en)

- CAS 108-88-3: zh = https://chemexact.cn/products/108-88-3 · en = https://chemexact.com/products/108-88-3
- CAS 67-56-1: zh = https://chemexact.cn/products/67-56-1 · en = https://chemexact.com/products/67-56-1
- CAS 64-17-5: zh = https://chemexact.cn/products/64-17-5 · en = https://chemexact.com/products/64-17-5
- CAS 71-43-2: zh = https://chemexact.cn/products/71-43-2 · en = https://chemexact.com/products/71-43-2
- CAS 108-95-2: zh = https://chemexact.cn/products/108-95-2 · en = https://chemexact.com/products/108-95-2
- CAS 75-09-2: zh = https://chemexact.cn/products/75-09-2 · en = https://chemexact.com/products/75-09-2
- CAS 67-64-1: zh = https://chemexact.cn/products/67-64-1 · en = https://chemexact.com/products/67-64-1
- CAS 50-78-2: zh = https://chemexact.cn/products/50-78-2 · en = https://chemexact.com/products/50-78-2

## Insights （行业洞察 / industry insights）

- 甲苯（Toluene, CAS 108-88-3）的生物毒理与安全研究综述: zh = https://chemexact.cn/insights/toluene-bioactivity-and-safety · en = https://chemexact.com/insights/toluene-bioactivity-and-safety
- 甲醇（Methanol, CAS 67-56-1）催化合成与工业应用最新进展: zh = https://chemexact.cn/insights/methanol-industrial-applications · en = https://chemexact.com/insights/methanol-industrial-applications
- 苯酚（Phenol, CAS 108-95-2）废水降解技术研究综述: zh = https://chemexact.cn/insights/phenol-degradation-environmental · en = https://chemexact.com/insights/phenol-degradation-environmental
- 乙醇（Ethanol, CAS 64-17-5）生物燃料发酵研究进展: zh = https://chemexact.cn/insights/ethanol-biofuel-research · en = https://chemexact.com/insights/ethanol-biofuel-research
- 苯（Benzene, CAS 71-43-2）职业暴露与健康效应: zh = https://chemexact.cn/insights/benzene-occupational-exposure · en = https://chemexact.com/insights/benzene-occupational-exposure
- 阿司匹林（Aspirin, CAS 50-78-2）心血管疾病预防研究: zh = https://chemexact.cn/insights/aspirin-cardiovascular-research · en = https://chemexact.com/insights/aspirin-cardiovascular-research