ChemDoodle 2D provides users with sophisticated tools for molecular drawing, facilitating the process of creating and editing molecular structures. The molecular editor within ChemDoodle 2D enables users to select elements and drag them into the drawing area, where they can also add atoms using mouse or keyboard shortcuts and connect them with bonds using the connection tool. Users have the flexibility to edit and modify these structures, whether it's adding or deleting atoms, altering bond types, or rotating bonds. They can also select specific parts of the molecule, such as atoms, bonds, or functional groups, for focused editing.

In addition to molecular drawing, ChemDoodle 2D offers annotation features that allow users to annotate their structures with text labels, chemical formulas, functional groups, and other relevant information. Furthermore, ChemDoodle 2D supports structure search functionalities, where users can input molecular structures or substructures to quickly identify corresponding compounds or reactions. The software can be seamlessly integrated with chemical databases, providing users with easy access to comprehensive information about specific molecules.

For chemical reaction representation, ChemDoodle 2D provides robust capabilities for drawing and editing chemical reaction equations. Users can employ the reaction tools to introduce reactants and products into the equations, effortlessly dragging and dropping the desired elements. They can also specify reaction conditions, such as temperature, pressure, and solvent, and incorporate them into the equations. Moreover, multiple reaction steps can be added to delineate the sequence and mechanism of the reaction in detail. Lastly, ChemDoodle 2D enables users to save their chemical reaction diagrams and export them in popular image formats like PNG and JPEG, or in vector graphics formats such as SVG. This brief overview should help users become more acquainted with the drawing features of ChemDoodle 2D and how to effectively utilize them.