Patent ID: 7888350

Claim:
A compound selected from compounds of the following formula and pharmaceutically acceptable salts thereof: wherein: each of R 1 and R 9 is independently selected from: —H, C 1-4 alkyl, C 2-4 -alkenyl, and halogenated C 1-4 alkyl; each of R 3NA and R 3NB is independently selected from: —H, C 1-4 alkyl, C 2-4 alkenyl, and halogenated C 1-4 alkyl; each of R 7NA and R 7NB is independently selected from: —H, C 1-4 alkyl, C 2-4 alkenyl, and halogenated C 1-4 alkyl; each of HX 1 and HX 2 is independently a protic acid.