wherein Ar1 (Ar1 corresponds to R4 structure II) is an aromatic radical; each of R5, R6, and R7 is a hydrogen atom, an aliphatic radical, a cycloaliphatic radical, or an aromatic radical; R3 is an aliphatic radical, cycloaliphatic radical, or an aromatic radical, and ???p??? is an integer having a value of from 0 to 4.