Live structure and properties from RCSB Protein Data Bank↗
Live science data
INTERACTIVE MOLECULAR KNOWLEDGE
See science
in three dimensions.
Search millions of molecules and explore real 3D conformers, polarity, bonding, and chemical properties.
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Popular molecules
INORGANIC CHEMISTRY
Essential inorganic compounds
HYDROCARBON ESSENTIALS
Alkanes & alkyl groups
Alkanes are complete molecules; alkyl groups are substituents formed by removing one hydrogen.
ORGANIC CHEMISTRY
Functional groups
Recognize the reactive patterns that determine how organic molecules behave.
BIOCHEMISTRY COLLECTIONS
Explore molecules of life
Study key compounds by biological role and drug class.
DAILY CHEMISTRY QUIZ
Test your chemistry
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Choose a subject and answer quick questions. The featured question changes automatically every 24 hours.
Next daily quizWhich species is a Brønsted–Lowry base?
PROTEIN STRUCTURES
Featured enzymes
Scientific, but understandable
MoleculAR makes chemistry simple, accessible, and free.
Millions of compounds
Search PubChem by common name, formula, systematic name, or identifier.
True 3D geometry
Rotate atomic coordinates, zoom into bonds, and compare molecular models.
Chemistry explained
Understand polarity, hydrogen bonding, lipophilicity, charge, and flexibility.
ABOUT THE PLATFORM
Useful information before you explore
MoleculAR is built for learning, revision, and scientific curiosity.DEVELOPMENT ROADMAP
The path from molecules to full reaction simulation
MoleculAR will grow in four focused learning stages, from foundational study tools to advanced interactive chemistry.- 1
STAGE 01 · IN PROGRESS Build the foundation
Flashcards plus a larger, carefully organized collection of molecules and enzymes for fast study and interactive 3D exploration.
Flashcards · More molecules · More enzymes - 2
STAGE 02 Master molecular construction
Visual lessons and practice tools for stereochemistry, organic synthesis, reaction planning, and advanced organic chemistry.
Stereochemistry · Organic synthesis · Advanced organic chemistry - 3
STAGE 03 Explore biochemical systems
Follow how living systems transform energy and information through metabolism, catabolism, and major biochemical pathways.
Metabolism · Catabolism · Information pathways · Advanced biochemistry - 4
STAGE 04 Chemistry Simulator
Simulate realistic reactions and compare how temperature, pressure, concentration, solvent, catalysts, and other conditions change the outcome.
Reaction environments · Conditions · Real-time outcomes
Where the information comes from
Molecular properties, identifiers, 2D diagrams, and compound records come from the U.S. National Library of Medicine’s PubChem database. Experimental protein structures come from the RCSB Protein Data Bank. Records may be updated by their source databases.
Live scientific records
When you search, MoleculAR retrieves available chemical properties and structural coordinates, then converts them into interactive 2D and 3D learning views. Calculated properties and experimental measurements are clearly presented but may not exist for every compound.
Models are representations
3D conformers show a plausible or experimentally determined arrangement, but molecules move and can adopt multiple shapes. Polarity labels simplify several properties and should be used as study guidance—not as a replacement for experimental data.
Safety and medical disclaimer
MoleculAR is an educational resource, not medical advice or a laboratory safety manual. Hazard classifications depend on concentration, dose, exposure route, and conditions. Always consult the current Safety Data Sheet before handling a chemical.
Minimal local preferences
MoleculAR does not require a separate account. Your light or dark theme preference is stored locally in your browser. Scientific searches are sent securely through MoleculAR’s server to PubChem or RCSB; the site does not sell search histories or use them for advertising.
Designed for more learners
The site supports keyboard controls, readable contrast, responsive layouts, dark mode, descriptive labels, and reduced-motion preferences. Chemical formulas retain proper subscripts and superscripts for clearer scientific reading.