Patent ID: 7750184

Claim:
A compound represented by formula (I); wherein; R and R′ are independently C 1 -C 5 alkyl, or together R and R′ form a saturated or unsaturated carbocyclic ring having from 3 to 8 carbon atoms; R PH is hydrogen or methyl; R1 and R2 are independently hydrogen, halo, or C 1 -C 5 alkyl; L 1 is —(CH 2 ) m —O—; L 2 is —(CH 2 ) m CH(OH)— or —(CH 2 ) m C(O)—; where m is 0, 1 or 2, R B is a branched C 3 -C 5 alkyl, R C is: —O—SO 2 —(R50) where R50 is —C 1-3 alkyl, or —(CH 2 ) 1-2 CF 3 ; —NH—SO 2 —(R50), where R50 is —C 1-3 alkyl, —CF 3 , or —(CH 2 ) 1-2 CF 3 ; —N(CH 3 )—SO 2 —C 1-2 alkyl; or —N(SO 2 R51) 2 where each R51 is independently, —C 1-3 alkyl, —CF 3 , or —(CH 2 ) 1-2 CF 3 .