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Create a new document to draw molecules on.

List all available documents

Open an existing document to continue working on it

Delete a document permanently

Create a new molecule from SMILES notation.

Delete an object from the canvas.

Move an object to new canvas coordinates.

Clear all objects from the canvas.

Add an atom to a molecule, optionally bonded to an existing atom.

Change the element of an atom.

Set the formal charge on an atom.

Pin (or reset) the number of hydrogens drawn on an atom.

Override (or reset) the lone-pair count drawn on an atom, and show the dots.

Draw (or hide) lone-pair and unpaired-electron dots on a molecule.

Delete an atom and all connected bonds.

Add a bond between two atoms.

Modify an existing bond's order or stereochemistry.

Delete a bond.

Add a ring template to the canvas.

Attach a functional group to an atom.

Recalculate 2D coordinates for a molecule, preserving canvas position.

Create a text label on the canvas.

Restyle an existing label: colour, size, weight, italic, family, underline.

Create a reaction or electron-pushing arrow on the canvas.

Recolour or re-weight an existing arrow (style.stroke / style.strokeWidth,

Recolour a molecule (QA-0066).

Get the current canvas state including all molecules

List all objects on the canvas with their IDs, types, and basic info

Export a molecule as SMILES string

Export a molecule in MOL file format (V2000)

Update document properties (title, notes)

Export a molecule in CDXML format (ChemDraw)

Import a molecule from MOL file (V2000) format

Validate molecular structure for common issues (valence errors, missing coordinates)

Analyze stereochemistry: identify stereocenters, E/Z double bonds, and validate wedge bonds

Clean up stereochemistry issues: fix wedge directions, remove redundant wedges, add missing wedges

Generate 3D coordinates for a molecule with optional geometry optimization

Export molecule to SDF format with 3D coordinates

Export molecule to 3MF format for 3D printing

Calculate physicochemical properties: MW, LogP, TPSA, H-bond donors/acceptors, drug-likeness (Lipinski, Veber)

Enumerate possible tautomers of a molecule

Calculate Gasteiger partial charges for all atoms

Analyze electron-donating/withdrawing effects of substituents (Hammett sigma values)

Search PubChem database by structure (identity, similarity, substructure)

Search PubChem database by compound name

Get detailed information about a PubChem compound by CID

Draw a complete chemical reaction with proper layout.

Display the document in the MolChart widget.