Patent ID: 8871788

Claim:
A compound of formula (I): wherein n is 0 or 1; m is 1 or 2; p is 1 or 2; X is O or HH; R is CH 3 , ethyl or propyl; R 1 is H, CH 3 or OCH 3 ; and R 2 is unsubstituted or substituted (C 1 -C 4 )alkyl, cyclohexyl, (C 5 -C 8 )cycloalkylcarbonyl, benzyl, benzoyl, phenylsulfonyl, furancarbonyl, tetrahydropyranyl, (C 1 -C 4 )alkoxycarbonyl, phenoxycarbonyl, (C 1 -C 4 )alkylaminocarbonyl, or phenylaminocarbonyl, wherein the substituents are selected from the group consisting of halogen, (C 1 -C 4 )alkyl, (C 1 -C 4 )alkoxy and (C 1 -C 4 )alkoxyCO—; or a salt thereof or an enantiomer or a diastereomer thereof.