{HEAD ~ The present invention} is also directed to {TAIL ~ labeled compounds}, e.g., methanol , acetates wherein the 13C atom is directly bonded to exactly one or two deuterium atoms 
{ HEAD ~ The present invention } is also directed to { TAIL ~ labeled compounds } , e.g. , methanol , acetates wherein the 13C atom is directly bonded to exactly one or two deuterium atoms
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH