PubChem
"[..] We collect information on chemical structures, identifiers, chemical and physical properties, biological activities, patents, health, safety, toxicity data, and many others."(About)
NDC: 431
ChemSpider
"A free chemical structure database providing fast text and structure search access to over 130 million structures from hundreds of data sources."(meta name="description")
NDC: 431
3Dchem.com - Chemistry, Structures & 3D Molecules
"This web site highlights areas of the chemical world and illustrates the structures behind the words. It also provides background information about the science of the chemicals. See the structures of small molecules, medical drugs, biological super-structures - enzymes, proteins, DNA, & virus - and the material world nano structures, all with colourful illustrations and interactive 3D. This web site uses Jsmol HTML5 technology to display the interactive 3D models."
NDC: 431
Welcome to ECS
"The Electrochemical Society is creating uninhibited availability of the science through open access and accelerating scientific discovery and innovation."(meta name="description")
NDC: 431