Is this the IUPAC name or a common name?

Both, when there are both: the systematic IUPAC name first, and the common name the library knows, such as Aspirin.

Why does it fall back to PubChem?

Athanor’s engine does not yet name fused or bridged ring systems, such as caffeine’s purine. It says so, and PubChem’s name is shown instead, labeled as PubChem’s.

Does it keep stereochemistry?

Yes. R and S, and E and Z, are worked out by the full priority rules and written into the name.

Can I name a structure I draw?

Yes, in the Athanor app: select a structure and use Name every structure in the Layers panel, or draw one in the free drawing tool and copy its SMILES here.

Is what I type saved?

No. It is named and drawn, and nothing is kept.

Structure to name: an IUPAC name generator

Free, no sign-up. What you type is sent to Athanor’s naming server, and to PubChem only when Athanor cannot name it; nothing is saved.

How to do it

Paste a SMILES, an InChI or a molfile, or type a common name.
Athanor names the structure with its own rules and draws it.
Copy the name or the SMILES.

How the name is made

Athanor names a chemical structure with its own systematic naming engine, the one the Athanor app uses, and checks every name by parsing it back into a structure before trusting it. It names chains, single rings (cycloalkanes, cycloalkenes, benzene, pyridine, furan, thiophene and pyrrole) and naphthalene, with their substituents and stereochemistry.

Fused and bridged ring systems such as purines and steroids have retained numberings the engine does not carry yet. For those it says so, and shows PubChem’s IUPAC name instead, labeled “(PubChem)”.

Questions

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