Why Chemical Names can be trouble... As a general rule, it's best to avoid using a chemical name as a search term unless the name is almost universally recognized and widely used. You're probably OK with names like toluene and ammonia. But even toluene has a synonym (methylbenzene) that describes its structure more accurately. The more complex the structure gets, the more names it can have and the more likely you are to miss something.
Fortunately, Chemical Abstracts Service (CAS) provides a great alternative to names and formulas with the CAS Registry Number, which serves as an unambiguous search term in many kinds of scientific databases. Use the RN if you have it, and if you don't have it it's a good idea to find it first.
Ultimately, the Registry Number is a shortcut to the chemical structure. The structure is the only unambiguous way to describe a molecule. Many databases allow you to draw a structure and search it. This can be a little tedious, but if there's any doubt you should do so. Toluene looks like this:
