18 steps from a single atom to stereochemistry, each one preloaded into the live editor: change the string and the structure follows, change the structure and the string follows.
The steps run in three groups — atoms, bonds and rings; then aromaticity and charges; then stereochemistry and the awkward corners of the notation.
Convert between chemical structures and SMILES in both directions, search a list of structures by substructure or SMARTS, and learn the notation step by step. Everything runs in your browser — no structure you open ever leaves your machine — so the tool needs JavaScript.