combines chemical structure drawing and molecular mechanics in one software application. With ChemPen3D, you can shift quickly between traditional line drawings of chemical structures and 2D or 3D molecular representations. You can rotate, tumble, and tilt drawings to view any aspect. Adjust drawings, then let the program autocalculate minimum stress configurations. Use the library of preformatted compounds to quickly build complex structures, then check the reaction information in a detailed parameters listing. Build reaction formulae with your molecular representations and let the software balance the reaction. Sample drawings, detailed help, and step-by-step tutorials will help the chemistry student to get the most out of the program quickly.