The ChemExper Chemical Directory displays information about chemicals - physical and chemical characteristics, structure, MSDS and more. Can be searched by registry number, molecular formula, chemical name or synonyms in different languages, substructure and by physical and chemical characteristics and combinations of those data. The directory includes three tools: Chemical Calculator, which calculates the molecular formula, molecular mass, exact mass, elemental analysis and plots the isotopic distribution graph; OSIRIS Property Explorer, which lets you draw chemical structures and calculates on-the-fly various drug-relevant properties whenever a structure is valid; and the chemical drawing tool ChemDoodle.

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