Patent ID: 7338960

Claim:
A compound of formula (I) or a pharmaceutically acceptable salt, or hydrolysable ester thereof, wherein: R 1 and R 2 are independently H or C 1-3 alkyl; X represents a O or (CH 2 ) n where n is 0, 1 or 2; R 3 and R 4 independently represent H, C 1-3 alkyl, —OCH 3 , —CF 3 , allyl, or halogen; X 1 represents O, S, SO 2 , SO, or CH 2 ; R 5 and R 6 independently represent hydrogen, C 1-6 alkyl (including branched alkyl and optionally substituted by one or more halogens or C 1-6 alkoxy), or together with the carbon atom to which they are bonded form a 3-6 membered cycloalkyl ring; and R 7 is wherein R is para —C 6 H 4 CF 3 , para —C 6 H 4 Me, para —C 6 H 4 CN or para —C 6 H 4 Cl.