In certain preferred embodiments, the molar ration of :{HEAD ~ A} is in {TAIL ~ the range} of 1:1 to 1:10 
is in
In certain preferred embodiments , the molar ration of : { HEAD ~ A } is in { TAIL ~ the range } of 1:1 to 1:10
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH