Patent ID: 7354966

Claim:
A compound of formula (I) or a salt or solvate thereof wherein: m, n, p and q independently represent an integer 1 to 12; R 1a , R 1b and R 1c independently represent C 1-3 alkyl or hydrogen; R 2 and R 3 independently represent C 1-4 alkyl optionally substituted with up to 5 fluorine atoms or â€”COC 1-2 alkyl optionally substituted with up to 5 fluorine atoms; R 4 and R 5 independently represent â€”CH 3 or hydrogen; X 1 and X 2 independently represent â€”(CH 2 ) 2 â€”, â€”(CH 2 ) 3 â€”, â€”CH(CH 3 )CH 2 â€”, â€”CH 2 CH(CH 3 )â€”, â€”CH(CH 3 )CH 2 CH 2 â€”, â€”CH 2 CH(CH 3 )CH 2 â€”, â€”CH 2 CH 2 CH(CH 3 )â€” or â€”COCH(CH 3 )â€”; and Y 1 and Y 2 independently represent â€”CH 2 â€” or carbonyl; with the proviso that when: p and q represent 1; m and n independently represent an integer between 1 to 12; R 4 and R 5 represent hydrogen; X 1 and X 2 represent â€”(CH 2 ) 2 â€”; and Y 1 and Y 2 represent â€”CH 2 â€”; then R 2 and R 3 may only represent â€”C 1-2 alkyl optionally substituted with up to 5 fluorine atoms or â€”COC 1-2 alkyl optionally substituted with up to 5 fluorine atoms.