nd wherein the molecular weight of the compound of the formula is about 1,040, (31) a compound of the formula (32) a compound of the formula wherein R1 and R2 each, independently of the other, is an alkyl group with from 1 to about 18 carbon atoms, (33) a compound of the formula (34) a compound of the formula wherein R1 and R2 each, independently of the other, is an alkyl group with from 1 about 1