The substructure M may be selected from a substituted or unsubstituted methylene chain, {TAIL ~ a substituted or unsubstituted oxyalkylene chain}, and a silicon containing chain or {HEAD ~ combination} thereof 
The substructure M may be selected from a substituted or unsubstituted methylene chain , { TAIL ~ a substituted or unsubstituted oxyalkylene chain } , and a silicon containing chain or { HEAD ~ combination } thereof
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH