oh, missed this one! https://doi.org/10.1021/acs.jcim.3c00820

"Most of the information about chemical species are sourced from #PubChem and #ChEBI data on the respective compound Web pages using a software agent, making OntoSpecies a comprehensive semantic database of chemical species able to solve novel types of problems in the field. Access to this reliable source of chemical data is provided through a #SPARQL end point."

Or maybe not. I bookmarked it in 2024