Patent ID: 6875775

Claim:
A compound of the formula: wherein R1 is H, halogen, OCH 3 , or OH; R2 is where X is O, and n is an integer from 1 to 4; and R4 and R5, which are the same or different, are a 1 to 4 carbon alkyl, H, —CH 2 C≡CH or —CH 2 CH 2 OH; or R4 and R5 form an N-containing five- or six-membered ring or heteroaromatic ring; and R3 is H, halogen, OH or —OCH 3 ; or a stereoisomer; or a non-toxic pharmaceutically acceptable salt or ester thereof or mixtures thereof, provided that a) when R2 is in the 4-position of the phenyl where R4 and R5 i) are the same, either methyl or ethyl; or ii) form an N-containing five-membered ring; then R1 and R3 cannot simultaneously be H; and b) when R2 is in the 4-position of the phenyl where R4 and R5, which are the same or different, are methyl or H.