A prodrug comprises {HEAD ~ a polyhydroxylated polyamine} to which a drug is linked by the intermediary of {TAIL ~ a peptidyl group} 
A prodrug comprises { HEAD ~ a polyhydroxylated polyamine } to which a drug is linked by the intermediary of { TAIL ~ a peptidyl group }
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL