ine and where r and r??? are independently integers of 0 to about 20, s is independently an integer of 1 to about 10 for each (CsH2sO, t is an integer of 1 to about 6, and p is an integer of 0 to about 4 with the proviso that there are at least 3 in-chain atoms between central core and at least one said chiral center of R*,