You're looking at StableBuild's Deleted PyPI mirror - where we index all deleted packages from the Python package registry.

pubchemtools
1.21

This version was deleted from PyPI around 2026-04-10. Installing fails with:
$ pip3 install pubchemtools==1.21 ERROR: Could not find a version that satisfies the requirement pubchemtools==1.21
View other deleted versions of pubchemtools

Install through StableBuild

You can install this package from StableBuild's PyPI snapshots from before the version was deleted:
pip3 install \ -i https://YOUR_API_KEY.pypimirror.stablebuild.com/2026-04-09/ \ pubchemtools==1.21
Sign up for StableBuild to get an API key (it's free and takes <60 seconds!)

Or, download files manually

And install manually via pip:
pubchemtools-1.21-py3-none-any.whl (10.5KB)
pubchemtools-1.21.tar.gz (11.7KB)