The WWW isn't the be all and end all you know.
Have you thought of trying a chemical abstracts search? I mean the old fashioned way looking throught the indexes for the empirical formula and getting references within? Ok, so you need a decent chemistry library.
I also use Beilstein Commander and Scifinder but unless your at Uni or within an organisation that may be out of reach too.
Whats your situation? Uni student or working in industry...
R.