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ChEBI - Chemical Entities of Biological Interest Chemical Entities of Biological Interest (ChEBI) is a freely available dictionary of molecular entities focused on "small" chemical compounds.	Chemie.de - Das Chemie-Fachportal Deutsches Fachportal für Chemie, Biochemie und Analytik mit Stoffdatenbanken und Marktübersichten.
ChemSpider - Royal Society of Chemistry Free chemical structure database providing fast access to over 100 million structures and properties.	NIST Chemistry WebBook Provides users with easy access to chemical and physical property data for chemical species through the internet. The data provided in the site are from collections maintained by the NIST Standard Reference Data Program and outside contributors.
Organic Chemistry Portal Scientific resource center offering reaction search, chemical synthesis details, and abstracts.
Periodic Table - Royal Society of Chemistry An interactive periodic table with dynamic layouts showing properties like atomic radii, states, trends, and orbitals. A modern equivalent for specialized tables.
Portal de Química y Laboratorio - QuimiNet Directorio de materias primas, fichas de seguridad químicas y recursos para la industria química.
PubChem Search and explore chemical information in the world"s largest free chemistry database. Search chemicals by name, molecular formula, structure, and other identifiers. Find chemical and physical properties, biological activities, safety and toxicity data.
Société Chimique de France - Ressources Espace de ressources, données scientifiques, annuaire et informations pratiques pour chimistes.
Tabla Periódica Interactiva - Triplus Química Recurso digital en español con datos de elementos, propiedades químicas, masa e isótopos.