HELM to structure
Free, no sign-up. It runs in your browser on Athanor’s own engine, and your structures never leave your device.
How to do it
Paste HELM notation.
Athanor reads it and draws the full structure.
Copy the SMILES or download a MOL file.
How it works
HELM (Hierarchical Editing Language for Macromolecules) writes a biopolymer as chains of monomers, such as PEPTIDE1{G.A}$$ for glycylalanine. Athanor reads the chains and builds the molecule atom by atom on its own engine, in your browser. Athanor itself reads and writes HELM, so a structure drawn there can be copied out as HELM too.
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Runs in your browser. No account needed to draw.