ii) at least one monomer or {HEAD ~ macromer} containing at least one free radical polymerizable group, wherein at least one of the monomers or {TAIL ~ macromers} includes an anhydride linkage 
ii ) at least one monomer or { HEAD ~ macromer } containing at least one free radical polymerizable group , wherein at least one of the monomers or { TAIL ~ macromers } includes an anhydride linkage
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD 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