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ChemPen is the low cost, easy to use tool for chemists, educators and students who need to create create drawings for chemical documentation. ChemPen includes everything in ChemPen plus basic C-13 chemical shift prediction. Drawing with ChemPen is done with menus, mouse clicks and simple editors. Drawings can be pasted into Windows® graphics applications. ChemPen calculates molecular weight, molecular formula and elemental composition. Watch the animation below or click the drawing to see how easy it was created with ChemPen.