OCSR.ai
Our way of giving back to science.
A free, open chemical search engine where anyone can search, analyze, and explore molecules — powered by the same AI engines behind Rasayan.
Search
Search any way you think
Four ways to find any molecule in our index.
Text Search
Search by compound name, IUPAC, trade name, SMILES, InChIKey, CAS number, or molecular formula.
Similarity Search
Find structurally similar compounds using Tanimoto similarity across our entire molecular index.
Image Recognition
Upload a photo of a chemical structure — from a paper, whiteboard, or notebook — and we recognize and search it automatically.
Draw & Search
Use the built-in Rasayan Draw editor to sketch your molecule and search directly from the drawing tool.
Compound Analysis
Every molecule gets a full profile
Click on any search result and get instant access to properties, predictions, and tools — including compounds that have never been synthesized.
ADMET Properties
1,100+ predicted endpoints covering absorption, distribution, metabolism, excretion, and toxicity profiles.
Molecular Docking
Dock any compound against protein targets using AutoDock Vina. Get binding poses, affinity scores, and interaction maps.
AMES Mutagenicity
State-of-the-art AMES prediction with structural alerts, SAR explanations, and ICH M7(R2) regulatory compliance.
Solubility & LogP
Aqueous solubility estimation, LogP prediction, and full physicochemical profiling with druglikeness context.
Drug-likeness Rules
Lipinski, Veber, Egan, Ghose, PAINS screening, QED scoring — comprehensive druglikeness assessment at a glance.
Novel Molecules
Not limited to known compounds. Paste any valid SMILES — even molecules never synthesized — and get a full analysis.
Powered by
Darvi AI
Every compound page on OCSR.ai is powered by Darvi — the scientific AI trusted by 2,400+ researchers worldwide. Click the eye icon on any compound page and ask anything about the molecule: properties, safety, synthesis routes, drug interactions, or regulatory data.
Darvi was built for scientists — not repurposed from a general-purpose AI. Every answer is grounded in real molecular data and scientific literature, so you can trust what it tells you.
Learn more about Darvi“Science must remain open and accessible to everyone for it to truly evolve.”
— Dr. Kohulan Rajan, Founder of DECIMER
No login required. No usage limits on search. No paywall on compound data. OCSR.ai is built on the same chemical intelligence engines that power Rasayan Engine — made freely available for researchers, students, and scientists everywhere.
Try it with your own SMILES. Paste a novel structure nobody has ever searched before. The system will characterize it, predict its properties, and let you dock it against protein targets — all in seconds.
Try OCSR.ai