R2 is a member selected from the group consisting of hydrogen, and alkyl and hydroxyalkyl groups having from 1 to about 4 carbon atoms and ##STR33## R3 is a member selected from the group consisting of hydrogen, halogen, and alkyl groups having from 1 to about 4 carbon atoms;R4 is a member selected from the group consisting of hydrogen, hydroxy and ##STR34## m is an integer equal to at least 1; n