why do you ask?
my knee jerk response to “thiols & mercaptans in cannabis” was
Dude, you’re supposed to use the non-oderized butane!
which isn’t super helpful, or the only source of stinky extract 
@Psilisophical posted a paper about 7 hrs ago that has a pretty extensive list of constituents…I didn’t note any thiols or mercaptans on the list.
I would however imagine, that because every single protein on the planet starts with a Methionine, and methionine can be converted enzymatically to mercaptans in your mouth, boiling “crude” for hrs at a time might yield some…