Patent ID: 8076359

Claim:
A compound of formula I, or a pharmaceutically acceptable salt thereof, or an optical isomer thereof, wherein X is N or CH; Y is O, CH 2 , or a bond; R 1 is —(CH 2 ) 1-3 OR 4 , or —O(CH 2 ) 1-2 OR 4 ; R 2 is selected from the group consisting of —(CH 2 ) 1-5 OR 4 , —O(CH 2 ) 2-4 OR 4 , —C(O)R 4 , —OR 4 , —O(CH 2 ) 2-4 O—(C 3 -C 8 cycloalkyl), wherein cycloalkyl is unsubstituted or substituted with C 1 -C 4 alkyl or C 1 -C 4 alkanol, —O(CH 2 ) 2-4 NR 4 R 5 , R 4 and R 5 are independently C 1 -C 6 alkyl unsubstituted or substituted with —OH or CF 3 .