About

Artur V. Eshtukov-Shcheglov, Independent Researcher, Moscow

The code was written with the assistance of Claude Opus 5.5 (Anthropic) and was reviewed and tested by the author.

The checks run in your browser: Python (Pyodide) and RDKit (RDKit.js) are loaded from this site and run on your computer. Nothing is installed, and the descriptions and files you check are not sent anywhere.

Every report carries a verification code, computed from the tool version, the entries and the results. Checking the same entries with the same version gives the same code, so a saved report can be compared with a new check.

Preprint (ChemRxiv): the checklist, Section 5.1 Registered protocol (OSF) Code (GitHub, MIT license) Running checkHNMR on your computer: step-by-step installation guide (GitHub) Archived code (Zenodo): doi:10.5281/zenodo.23749627

Version history

The version is shown in the header of every page and in every report. A verification code is tied to the version that produced the report, so a saved report is compared with a new check made with the same version.

31 October 2026 — V2.1.3-beta. Item 4(b) also has a lower bound for methyl groups: a methyl singlet that only a CH₃ next to a carbon with a proton could give (such a CH₃ is split, ³J about 7 Hz) is shown as an alert B. On 5,120 development descriptions with structures, 34 get this alert and no other result changes. The Excel table and the Word report of the local version list items 2, 5 and 7 as not checked. Code: doi:10.5281/zenodo.23823029.
30 October 2026 — V2.1.2-beta. The non-first-order notation of Tang, Xu and Hoye (Molecules 2025, 30, 2610): “nfod”, “nfot” and “nfom” with J_app, and sums of constants written as the splitting (“J_o + J_p = 8.6 Hz”), are read as apparent values. No description changed among 7,745 published descriptions used for regression. Code: doi:10.5281/zenodo.23784006.
29 October 2026 — website only; the checks did not change. Signals typed with Cyrillic look-alike letters, other dashes or extra spaces are highlighted in the report; a format alert (C) shows Cyrillic letters; Cyrillic look-alikes in the HRMS, ¹⁹F and ³¹P fields are read as Latin; highlighting is kept when a report is printed.
28 October 2026 — website launched with V2.1-beta (local version V2.1.1-beta, identical checks). Code: doi:10.5281/zenodo.23749628.

All changes: CHANGELOG (GitHub).