In still another aspect, the invention is directed to an impermeable active agent delivery system for delivering {HEAD ~ an active agent} that is susceptible to {TAIL ~ degradation} 
is susceptible to
In still another aspect , the invention is directed to an impermeable active agent delivery system for delivering { HEAD ~ an active agent } that is susceptible to { TAIL ~ degradation }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL REL TAIL TAIL TAIL TAIL TAIL