Patent ID: 8148173

Claim:
A compound having a structure as shown in Formula I: wherein R 1 is selected from the group consisting of hydrogen, C 1 -C 6 alkyl, amino, N—C 1 -C 6 -alkylamino, and N,N—C 1 -C 6 -dialkylamino; and ring “A” is selected from the group consisting of unsubstituted or substituted C 4 -C 8 -cycloalkenyl, unsubstituted or substituted bicyclo[2,2,1]alkenyl, and unsubstituted or substituted bicyclo[2,2,2]alkenyl, unsubstituted phenyl, and phenyl substituted with a moiety selected from the group consisting of C 3 -C 6 -alkenyl, acryl, acryl-C 1 -C 6 alkyl, acrylamido, and acrylamido-C 1 -C 6 alkyl.