How to insert a structure by name, SMILES or CAS number

Press / (Quick insert), type a name such as caffeine, a SMILES string or a CAS number, and press Enter. The structure lands on the canvas, ready to edit.

On a Mac, Ctrl is Cmd.

Pressing / and typing caffeine, then Enter places the structure.

Steps

  1. Press / anywhere in a document. The Quick insert box opens.

  2. Type what you want. Athanor reads it as you type and labels the reading at the right of the box:

    • a name or synonym, such as caffeine (Name), with matches from the library, each with its drawing;

      Quick insert finding Caffeine by name, from the library, with xanthine as a second match.Quick insert finding Caffeine by name, from the library, with xanthine as a second match.

    • a SMILES string, such as CC(=O)Oc1ccccc1C(=O)O (SMILES);

      Quick insert reading an aspirin SMILES string and offering it as typed.Quick insert reading an aspirin SMILES string and offering it as typed.

    • a CAS number, such as 58-08-2 (CAS number).

      Quick insert finding caffeine by its CAS number, 58-08-2.Quick insert finding caffeine by its CAS number, 58-08-2.

  3. Use ↑ and ↓ to pick a different match.

  4. Press Enter to place it. Esc closes the box without inserting anything.

More from the box

  • Text instead of a structure: Alt+Enter places what you typed as plain text.
  • Online sources: when the library has no match, pressing Enter asks arbastro's server and PubChem. Online suggestions while typing, at the bottom of the box, asks them after each pause in typing instead. It is off by default, so nothing you type leaves your device before you press Enter.

Tip

Quick insert is also in Search everything (Ctrl+K): its last rows offer Quick insert "…" for whatever you typed.

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Last updated Nov 12, 2026