You can always make some by oxidizing some lignin, too. It's actually one of the flavor components in 'charred oak' barrels used for aging spirits. The only problem is that there's a bunch of oxidation products - but I do know the vanillin resolves well on HPLC, so you ought to be able to purify it if you ever need to (or just want to have fun?).
haha lignin!!!
I guess there will be lots of low molecular weigh molecules? Probably GC would be better? XDD
I only recall the bad smell of the burning wood and leafs
There's a bunch!
The ratios and stuff also depend on the wood source and oxidation method.