acs is one of the world’s largest scientific societies and the premier home of chemistry professionals. find career opportunities, educational resources, professional development, and much more.

chemspider is a free chemical structure database providing fast access to over 100 million structures, properties and associated information.

化源网提供快速cas号查询，cas no查询，msds查询，数百万化合物的专业数据，包括物化, msds, 安全信息, 合成路线及文献, 毒性，上下游，期刊文献等。

chemicalbook is a platform dedicated to provide the most valuable resources for chemical industry users. here you can get chemical information (such as chemical physical properties, safety data, excellent china suppliers and their web addresses and etc.)by searching the name, cas number, molecular formula, molecular weight, mdl number, einecs number, structure.

advancing excellence, connecting chemical scientists and shaping the future of the chemical sciences for the benefit of humanity.

x-mol科学知识平台，顶级期刊论文图文内容每日更新，海内外课题组信息，行业新闻文摘，化学类网址导航，化学软件和数据库导航，及更多其他内容

tci is a global manufacturer of chemicals for research and development, with reagents for chemistry, life science, materials science, and analytical chemistry.

毕得医药(bidepharm) 成立于2007年,是一家以生产医药中间体为主的高新技术企业，提供50000+产品库存,保证当天发货,提供检测图谱(nmr、hplc等).产品包括医药中间体,杂环砌块,有机砌块,硼酸,催化剂,抑制剂-分子库,分析试剂-标准品.涉及精细化工,有机化学,生命科学,材料科学等领域.

探索-中国科学服务首席提供商,为科研人员提供一站式解决方案。产品包括科研试剂、常规耗材、生物耗材、常备仪器、生物仪器、分析仪器、实验工具、员工防护、工业安全、ika、梅特勒、磁力搅拌、天平、通用试剂、高纯溶剂、异构烷烃、化学试剂、hplc级溶剂、氘代试剂、催化剂、实验家具、办公用品、解决方案,无论您想选择一副手套还是建设整个实验室，一切尽在探索！