{TAIL ~ Formation} of an ester or an amide of the disulfide compound led to not only prolongation of {HEAD ~ the duration} but also improvement of absorption characteristics as a result of increase of lipophilicity 
{ TAIL ~ Formation } of an ester or an amide of the disulfide compound led to not only prolongation of { HEAD ~ the duration } but also improvement of absorption characteristics as a result of increase of lipophilicity
TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH