To be clear, "denatured" just means it has had something added to it to keep it from being consumed. It can be any type of alcohol. The stuff you're using sounds like the common solvent "MEK", not denatured alcohol. It's odd they'd sell it labeled as such. As for ketones, that's the class of chemical acetone is. If you buy a can of hardware store acetone, it's nearly 100% acetone and thus nearly 100% ketone.