An additional preferred embodiment of this invention is the novel compounds as represented by general Formula III wherein each of m and m' is the integer 2, and each R and R.sub.1 substituent isselected from chlorine, fluorine, bromine, hydroxy, a lower alkoxy group of from 1 to 4 carbon atoms and a straight chain alkyl group of from 1 to 4 carbon atoms.Illustrative examples of the compounds descr