{TAIL ~ The compounds} of this invention have the general formula ##STR2## wherein R is OH, CO2 H, NH2, or NCS and each of x and y, independently, is {HEAD ~ an integer} selected from 1 to about 10 
{ TAIL ~ The compounds } of this invention have the general formula # # STR2 # # wherein R is OH , CO2 H , NH2 , or NCS and each of x and y , independently , is { HEAD ~ an integer } selected from 1 to about 10
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH 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