Patent ID: 8258175

Claim:
A compound of formula 1: and/or a pharmaceutically acceptable salt thereof, wherein X is O; R1 is selected from substituted or unsubstituted alkyl, substituted aryl or heteroaryl, unsubstituted heteroaryl and substituted or unsubstituted aralkyl or heteroaralkyl; R2 is selected from substituted or unsubstituted alkyl, substituted or unsubstituted hydroxyalkyl and substituted or unsubstituted aralkyl or heteroalkyl; R3 is selected from substituted or unsubstituted aryl; and R4-R7, is used to represent groups R4, R5, R6 and R7 which are independently selected from H, OH, alkyl, alkoxy, hydroxyalkyl, halo, CF3, NH2, NO2, COOH, wherein, when R1 is a substituted or an unsubstituted alkyl group having 1 to 6 carbon atoms, R2 is not an unsubstituted alkyl group having 1 to 6 carbon atoms; and wherein when R1 is a substituted or unsubstituted benzyl or substituted aryl, R2 is not methoxybenzyl or an unsubstituted alkyl group having 1 to 6 carbon atoms.