Patent ID: 8110598

Claim:
A compound of the formula (I) comprising: wherein R 1 is methyl, R 2 and R 3 are H, and R 4 is selected from halogen, hydroxy, formyl, nitro, oxo, thio, unsubstituted or substituted groups selected from alkyl, cycloalkyl, alkoxy, cycloalkoxy, aryl, aralkyl, aralkoxyalkyl, heterocyclyl, heteroaryl, heteroaralkyl, acyl, acyloxy, hydroxyalkyl, amino, acylamino, arylamino, aminoalkyl, aryloxy, aralkoxy, alkylamino, alkoxyalkyl, alkylthio, thioalkyl groups, thioalkyl, alkylsulfenyl, alkylsulfonyl, carboxylic acid, sulfonic acid, phosphonic acid and derivatives thereof; n is 2; and M + is a pharmaceutically acceptable salt.