Hmm not sure, got that from an ingredients database on the web. I don't think I've ever *bought* a box of oreos so I wouldn't know... Sorry!
In addition to the HFCS (if it's still in there, assuming it is as it's in most cookies now, it's so cheap to make) solid chocolate is (or, at least, was) used to make the cookie part, and that can be very problematic to most IBS-ers.