ChemPencil is a powerful and easy to use Mac App for drawing organic molecules. ChemPencil tools and features include: ? Draw bonds and molecules in ACS standardized style. ? Label heteroatoms directly in the drawing without losing sight of your document. ? Add common abbreviations to atom’s labels. ? Heteroatom’s labels rearrange conveniently when rotating the molecule. ? Represent bond stereochemistry with hashed and bold bond type. ? Ring building tools to draw aromatic and aliphatic rings. ? Add text to the document for example for naming a molecules or naming a reaction scheme. ? Export or email your document as a PDF. ? Select and copy molecules in ChemPencil and paste them directly in your Keynote document. ? Calculation and plot of isotopic distribution graph.