Easily draw molecules and mechanisms for free.

Structura is a free, cross-platform chemical drawing application for creating and editing structures, reaction schemes and mechanisms.

Download for macOS

Available for macOS · Windows · Linux · all downloads

caffeine.str — Structura

Structura structure editor showing caffeine drawn on the canvas, with live formula, molecular weight, SMILES and IUPAC name in the analysis panel

Overview

Uses and features.

Research

Prepare drawings for research and publication

Create structures, schemes and mechanisms for papers, proposals and presentations. Angle snapping and clear feedback help keep drawings consistent.

Structura's Draw bond tool dragging a bond freehand, before angle snap locks it to the grid

Structura's Add structure search box, ready to search PubChem by name, SMILES or CAS number

Molecule search

Find and view molecular structures

Search using names, formulae, SMILES or CAS numbers. View chemical information, then insert and edit structures in your document.

Molecule manager

Organise and reuse molecular structures

Save templates, fragments and favourites in the molecule manager for use across documents.

Structura's Insert library Molecules tab showing starred favourites: Benzene, Boc Group and Glycine

Structura's Themes gallery with the house default Structura theme in use

Teaching

Teaching materials

Prepare structures and mechanisms for lectures, tutorials and teaching materials. Use themes to adapt drawings for slides, publications and classroom work.

Free.

No subscription, licence key, account or telemetry. Available for Windows, macOS and Linux.

Download for macOS