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BKChem

A free chemical drawing program

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BKChem is a free chemical drawing program. It is written in Python and runs on any platform that supports Python. It allows bond-by-bond drawing, supports templates of common rings, linear formulas, radicals, charges, arrows, rich text, and vector graphics. It includes unlimited undo/redo, alignment, scaling, 2D and 3D rotation, and conformation changes. It exports to SVG, OpenOffice Draw, ODF, Encapsulated PostScript, PDF, and PNG. It imports CML, Molfiles, SMILES, and INChI. It has localization support and a plugin system.

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