{HEAD ~ The dithiane} can be used as {TAIL ~ a non volatile carrier} of the desired carbon and hydrogen labels 
used as
{ HEAD ~ The dithiane } can be used as { TAIL ~ a non volatile carrier } of the desired carbon and hydrogen labels
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH