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