Exact Mass / Isotope Pattern

Overview

Calculate monoisotopic exact mass and an approximate M, M+1, M+2 isotope pattern from molecular formulas. It is in the Spectra & Analysis category and is intended to support compound confirmation, chromatographic method planning, and first-pass spectral interpretation.

When To Use It

• You need a focused workflow for exact mass / isotope pattern without leaving ChemistryAtlas.
• You want a result that can be saved, shared, or chained into another chemistry app.
• You want the calculation assumptions and limitations visible next to the output.

Inputs

• text - Compound names, formulas, SMILES, or InChI - type: textarea - required - Enter one compound per line. Names use PubChem lookup; SMILES and InChI use RDKit when available; formulas fall back to formula parsing.
• files - Formula CSV or TXT file - type: file - accepts .csv, .txt - CSV/TXT uploads use the first column or line-delimited formulas.

Recommended Workflow

• Provide the molecule, formula, peak list, chromatographic conditions, or instrument context; compare predicted features against measured data; then export the explanation and candidate table.
• Start with the smallest representative input, confirm the parser understood it, then scale to a larger list or workflow.
• Save the generated report when the result will feed a notebook entry, route review, model comparison, or team discussion.

Outputs

• A Markdown-style chemistry report with parsed inputs, assumptions, and calculated or predicted results.
• Structured tables when the app returns multiple compounds, reagents, routes, peaks, candidates, or model rows.
• Warnings, fallback notes, and sidecar availability messages when a specialized engine is not installed or not reachable.

Method And Backend Notes

This app has a runnable ChemistryAtlas backend path. Backend type: rule. Fast formula-based MS confirmation helper. High-resolution instrument-specific modeling can be added later. Use the output as a structured starting point for chemistry judgment, follow-up calculation, or experimental planning.

How To Interpret Results

• Use predictions as confirmation aids, not as replacements for calibrated instrument software, standards, or expert spectral assignment.
• Compare results across related molecules, controls, blanks, literature examples, or known reactions whenever possible.
• For decisions that affect safety, synthesis scale-up, biological testing, purchasing, or publication, verify with primary data and expert review.

Example Input

C8H10N4O2
C6H5Br

Common Checks Before Acting

• Confirm names, salts, stereochemistry, tautomers, protonation state, and hydration state.
• Check units, concentrations, equivalent definitions, and significant figures.
• Record external database versions, model versions, sidecar availability, and any manual edits made after the app output.

Related Apps

• 1H / 13C NMR Predictor (nmr-predictor)
• MS Fragmentation Predictor (ms-fragmentation-predictor)
• Spectroscopy Predictor (spectroscopy-predictor)
• Chromatography Method / Retention Helper (chromatography-retention-helper)
• Conformer Generator + 3D Viewer (conformer-3d-viewer)

Acknowledgements And Validation

• ChemistryAtlas documentation and UI were prepared for chemistry discovery workflows.
• Where available, calculations may use open-source cheminformatics, reaction-informatics, spectra, docking, or machine-learning engines such as RDKit-family tooling, ASKCOS-style sidecars, ChemProp, ms-pred/ICEBERG, PyScreener, and MolPAL.
• Always verify important results against primary literature, official SDS records, instrument software, validated models, and local laboratory procedures.