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