Patent ID: 7468449

Claim:
A compound represented by a formula below or a pharmaceutically acceptable salt derivative thereof: wherein; R and R′ are independently C 1 -C 4 alkyl; R P , R p′ , and R F are independently selected from the group consisting of hydrogen and C 1 -C 4 alkyl; (L 1 ) is oxygen; (L 2 ) is —C(R40) 2 —, where each R40 is independently hydrogen, C 1 -C 5 alkyl or C 1 -C 5 fluoroalkyl; (L 3 ) is —C(═X 1 ) —, where X 1 is O, S, CH 2 , or; (L F ) a bond; Z F is where R4 and R5 are independent hydrogen, C 1 -C 4 alkyl, —O—C 1 -C 4 alkyl, C 2 -C 4 alkenyl, C 2 -C 4 alkynyl, C 1 -C 4 haloalkyl, —NH(C 1 -C 4 alkyl), or cyclopropyl, with the proviso that only one of R4 or R5 may be hydrogen; Z P is methyl, ethyl, n-propyl, 1-methylethyl, 1-methylpropyl, 2-methylpropyl, 1,1-dimethylethyl, 1,1-dimethylpropyl, 1,2-dimethylpropyl, or 2,2-dimethylpropyl.