{HEAD ~ Compounds} of the formula B1 with Y being a direct bond are {TAIL ~ diesters} of macromolecular diols, wherein two hydroxy groups are attached to the polycondensate chain R1 in opposite terminal or almost terminal positions, with α,β unsaturated acids 
are
{ HEAD ~ Compounds } of the formula B1 with Y being a direct bond are { TAIL ~ diesters } of macromolecular diols , wherein two hydroxy groups are attached to the polycondensate chain R1 in opposite terminal or almost terminal positions , with α , β unsaturated acids
HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL 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