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