Patent ID: 7217821

Claim:
A compound having the following formula (I): in which the radicals R, which are identical or different, are each a radical of formula (II): said compound being selected from the group consisting of: (i) the compounds in which the following conditions are met: (a) n=m=0; and (b) R 1 , R 2 , and R 3 are each a C 1 –C 4 alkyl radical, or R 3 is hydrogen and R 1 and R 2 together form a C 5 –C 8 ring optionally substituted with one or two C 1 –C 4 alkyl radicals; (ii) the compounds in which the following conditions are met: (a) n=1, m is 0 or 1, R 3 is hydrogen or a C 1 –C 4 alkyl radical, R 4 is a C 1 –C 4 alkyl radical and R 5 is hydrogen or a C 1 –C 4 alkyl radical; or n is 0 or 1, m=1, R 3 is hydrogen or a C 1 –C 4 alkyl radical, R 4 is a C 1 –C 4 alkyl radical and R 5 is a C 1 –C 4 alkyl radical; and (b) R 1 and R 2 are each a C 1 –C 4 alkyl radical; (iii) the compound of formula (1): (iv) the compound of formula (3):