ChemIndustry.com has a database of alternate names for chemicals! It takes a few steps to use it, but it’s very much worth the effort. To use this database, type the name of the chemical in the “search” box at the top of the page. Then click on “synonyms” at the bottom of the listing of the chemical. (I circled these two areas on the below screen shot).
When you click on “synonyms,” a very long list will pop-up.
Here’s a small sample from my search on polyethylene glycol: