Educational demonstration · Not clinically validated

Molecular descriptor demonstration

A structure and descriptor calculator—not a predictor of efficacy, safety, binding affinity or clinical outcomes. Pattern labels and Lipinski rules are heuristics, not a verified drug classification.

Not for diagnosis, treatment, dosing or patient-specific decisions.

Use public example molecules only. Calculation occurs in the browser, but a third-party chemistry library is loaded from a CDN. Do not enter confidential structures. Only tutorial dismissal preferences are stored locally. No demo input is submitted by this page.

Evidence status and limitations · Inspect this page’s model source

Enter a molecule

See the structure

Molecular formula--

Canonical SMILES--

Computed properties

LogP

PSA

HBD

HBA

RotBonds

Heavy Atoms

Aromatic Rings

Lipinski Rule of Five

MW < 500

LogP < 5

HBD < 5

HBA < 10

Structural-pattern heuristic

Pattern label

Enter a public SMILES example to inspect a pattern label

Analysis Pipeline

SMILES Parsing

Read the SMILES string and turn it into atoms, bonds, and branches

Molecular Weight

Add atomic masses and account for implicit hydrogens

Lipophilicity (LogP)

Estimate how oily or water-loving the molecule is using atom-type contributions

Polar Surface Area

Measure the polar surface from nitrogen, oxygen, and sulfur atoms

Hydrogen Bond Donors/Acceptors

Count OH and NH groups as donors, and N and O atoms as acceptors

Lipinski Compliance

Apply the Rule of Five: MW<500, LogP<5, HBD<5, HBA<10

Drug Classification

Match the structure against common pharmacophore patterns

What this tells you

This standalone calculator shows molecular descriptors, not a full oNeura simulation. Rule-of-five checks do not prove bioavailability, efficacy or safety. Pattern matching can misclassify molecules. The engine label identifies OpenChemLib or the limited fallback parser; fallback estimates need independent checking.