Patent ID: 7582775

Claim:
A compound or a pharmaceutically acceptable salt thereof represented by a formula below: wherein R and R′ are independently C 1 -C 5 alkyl, or together R and R′ form a carbocyclic ring having from 3 to 8 carbon atoms; RP 3 is hydrogen, or C 1 -C 5 alkyl; (L P1 ) is —(CH 2 ) m —O—; (L P2 ) is is where m is 0, 1, or 2; Z P is a branched C 3 -C 5 alkyl or 1-ethyl-1-hydroxypropyl; Z TB is selected from —O—SO 2 —(C 1 -C 5 alkyl,) —CO 2 H, —CO 2 Me, —CO 2 Et, —C(O)NH 2 , —C(O)NMe 2 , —C(O)NH—CH 2 —C(O)OH, —C(O)NH—CH 2 —C(O)OMe, —C(O)NH—CH 2 —C(O)OEt, —C(O)NH—CH 2 —C(O)OiPr, —C(O)NH—CH 2 —C(O)OtBu, —C(O)NH—CH(Me)-C(O)OH, —C(O)NH—CH(Me)-C(O)OMe, —C(O)NH—CH(Me)-C(O)OEt, —C(O)NH—CH(Me)-C(O)iPr, —C(O)NH—CH(Me)-C(O)tBu, —C(O)NH—CH(Et)-C(O)OH, —C(O)NH—C(Me) 2 -C(O)OH, —C(O)NH—C(Me) 2 -C(O)OMe, —C(O)NH—C(Me) 2 -C(O)OEt, —C(O)NH—C(Me) 2 -C(O)iPr, —C(O)NH—C(Me) 2 -C(O)tBu, provided that -(L TB )-Z TB is substituted at either the 5 or 6 position of the benzothiophene ring.