 each independently            stand for a radical selected from the group consisting of methyl,  - CF0,  - CHF0,  - CH0F, ethyl,  - CF0 - CH0,  - CH0 - CF0,  - C0F0, n-propyl, isopropyl, n-butyl, sec-butyl, isobutyl, tert-butyl, n-pentyl, 0-pentyl, n-heptyl, 0-heptyl, n-octyl, n-nonyl, 0-nonyl, (0,0)-dimethylhept-0-yl, 0-methylbutyl, n-hexyl, (0,0)-dimethylbutyl and ethenyl;            R00 stands for a radical selected from the group consisting of methyl,  - CH0 - O - CH0, ethyl, n-propyl, n-butyl, sec-butyl, isobutyl, tert-butyl, n-pentyl, 0-pentyl, n-hexyl, (0,0)-dimethylbutyl,  - CH0 - CH0 - O - CH0,  - CH0 - CH0 - O - C0H0, and  - CH0 - CH0 - CH0 - O - CH0