A discussion of {HEAD ~ the use} of {TAIL ~ prodrugs} is provided by T. Higuchi and W. Stella, “Pro drugs as Novel Delivery Systems,” Vol 
of
A discussion of { HEAD ~ the use } of { TAIL ~ prodrugs } is provided by T. Higuchi and W. Stella , “ Pro drugs as Novel Delivery Systems , ” Vol
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH