Other compounds of the present invention are represented by the general structural formula: ##STR2## wherein the X group is selected from the group consisting of hydroxy and C1-6 alkoxy, such as for example methoxy to reduce lipophilicity; the R group s selected from the group consisting of hydrogen, --CH3 and --CH2 OH, and the R2 group is selected from the group consisting of --CH2 CH2 OH and --C