Chemistry Drawing

Elemental is an intuitive and powerful chemistry drawing and depiction tool for Windows, Mac OS X, iPad and iPhone. Elemental can be used to easily generate and alter chemical structures, reactions and queries. It is web-based and it runs in all major browsers.

Some of Elementals key features include:
Easy manipulation of atom and bond properties
Built-in templates of common substructures
Customise your own templates
Files supported: MOL, RXN, SMILES or SMARTS
Valence violations are automatically flagged up
Atom queries: ring bonds, H- count, substitutions, unsaturated
Bond queries: type, topology, stereochemistry
Atom inclusion and exclusion lists