QUESTION BANK · 2026

Structure editor

Draw a molecule with a real chemical structure editor — bonds, rings, charges, stereo — instead of only picking an option. Built on JSME (Novartis / Bruno Bienfait, BSD-3-Clause), loaded only once you open it.

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Draw anything

No expected answer — draw whatever you like and take the SMILES / molfile with you.

Practice: draw the molecule named

Checked automatically against the correct structure — by re-canonicalising both structures, not by how you happened to draw it, so any valid way of drawing the same molecule is accepted.