The composition 1, wherein {HEAD ~ the polymer system} comprises hydroxypropylmethylcellulose and {TAIL ~ ethylcellulose} 
comprises
The composition 1 , wherein { HEAD ~ the polymer system } comprises hydroxypropylmethylcellulose and { TAIL ~ ethylcellulose }
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH TAIL TAIL TAIL TAIL TAIL