| abstract |
A compound of any one of formulas IV, V, VI or VII: ** Formula ** where: R1 is selected from the group consisting of hydroxyl, amino, halo, hydroxyalkyl, alkylmethoxy, cycloalkylmethoxy and arylmethoxy; R2 is selected from the group consisting of hydrogen, halo, amino, methoxy, ethoxy, nitro, phenyl, dialkyl, dihalo, trifluoromethyl and hydroxyl; and R3 is selected from the group consisting of hydrogen, alkyl, cyclic alkyl, and arylmethoxy, or a pharmaceutically acceptable derivative, unmetabolite, or salt thereof. |