A compound represented by Formula I or Formula II: or a pharmaceutically acceptable salt, a stereoisomer, and/or an N-oxide thereof, wherein: R 1 and R 2 are independently selected from the group consisting of hydrogen, -C 1 -C 6 alkyl, -C -C 1 -C 6 alkyl, -C -O-C 1 -C 6 alkyl, and -O-CH 2 -phenyl; R 3 is selected from the group consisting of hydrogen, -C 1 -C 6 alkyl, -C -R 31, and - C -O-R 32; R 31 is selected from the group consisting of hydrogen, -C 1 -C 6 alkyl; -C 1 -C 6 haloalkyl, - C 3 -C 6 cycloalkyl, and phenyl; R 32 is selected from the group consisting of hydrogen, -C 1 -C 6 alkyl; -C 1 -C 6 haloalkyl, - C 3 -C 6 cycloalkyl, and phenyl; wherein any aforementioned C 1 -C 6 alkyl, independently for each occurrence, is optionally substituted by one, two or three substituents each independently selected from -C NR a R b, -NR a R b, hydroxyl, -SH, phenyl, -O-CH 2 -phenyl, and halogen; and any aforementioned phenyl, independently for each occurrence, is optionally substituted by one, two or three substituents each independently selected from -C NR a R b, - NR a R b, -C 1 -C 3 alkoxy, hydroxyl, and halogen; or R a and R b are each independently for each occurrence selected from the group consisting of hydrogen, -C -O-CH 2 -phenyl, and -C 1 -C 3 alkyl; or R a and R b taken together with the nitrogen to which they are attached form a 4-6 membered heterocyclic ring; R 4, R 5, R 6 and R 7 are each independently selected from the group consisting of hydrogen, halogen, hydroxyl, phenyl, amido, amino, C 1-4 alkyl, C 2-4 alkenyl, -NH-C -C 1-6 alkyl, -NH-C -C 1-6 alkylene-phenyl, -NH-C -O-C 1-6 alkyl, and-NH-C -O-C 1-6 alkylene-phenyl; wherein C 1-4 alkyl, C 1-6 alkylene, C 2-4 alkenyl, C 1-4 alkoxy, and phenyl are optionally substituted by one or more substituents selected from R P; two R 5 s taken together form an oxo moiety; or wherein for the compound of Formula I, R 6 and R 7 taken together with the adjacent carbons to which they are attached form a 3-membered carbocyclic ring which is optionally substituted by one or two substituents independently selected from the group consisting of halogen, hydroxyl, -C 1 -C 3 alkyl, -C 1 -C 3 alkoxy, -C NR a R b, and -NR a R b; and R P is selected, independently for each occurrence, from the group consisting of carboxy, hydroxyl, halogen, amino, phenyl, C 1-6 alkoxy, and C 1-6 alkyl optionally substituted by one or more substituents independently selected from the group consisting of halogen, hydroxyl and amino. R 1 and R 2 are independently selected from the group consisting of hydrogen, -C 1 -C 6 alkyl, -C -C 1 -C 6 alkyl, -C -O-C 1 -C 6 alkyl, and -O-CH 2 -phenyl; R 3 is selected from the group consisting of hydrogen, -C 1 -C 6 alkyl, -C -R 31, and - C -O-R 32; R 31 is selected from the group consisting of hydrogen, -C 1 -C 6 alkyl; -C 1 -C 6 haloalkyl, - C 3 -C 6 cycloalkyl, and phenyl; R 32 is selected from the group consisting of hydrogen, -C 1 -C 6 alkyl; -C 1 -C 6 haloalkyl, - C 3 -C 6 cycloalkyl, and phenyl; wherein any aforementioned C 1 -C 6 alkyl, independently for each occurrence, is optionally substituted by one, two or three substituents each independently selected from -C NR a R b, -NR a R b, hydroxyl, -SH, phenyl, -O-CH 2 -phenyl, and halogen; and any aforementioned phenyl, independently for each occurrence, is optionally substituted by one, two or three substituents each independently selected from -C NR a R b, - NR a R b, -C 1 -C 3 alkoxy, hydroxyl, and halogen; or R a and R b are each independently for each occurrence selected from the group consisting of hydrogen, -C -O-CH 2 -phenyl, and -C 1 -C 3 alkyl; or R a and R b taken together with the nitrogen to which they are attached form a 4-6 membered heterocyclic ring; R 4, R 5, R 6 and R 7 are each independently selected from the group consisting of hydrogen, halogen, hydroxyl, phenyl, amido, amino, C 1-4 alkyl, C 2-4 alkenyl, -NH-C -C 1-6 alkyl, -NH-C -C 1-6 alkylene-phenyl, -NH-C -O-C 1-6 alkyl, and-NH-C -O-C 1-6 alkylene-phenyl; wherein C 1-4 alkyl, C 1-6 alkylene, C 2-4 alkenyl, C 1-4 alkoxy, and phenyl are optionally substituted by one or more substituents selected from R P; two R 5 s taken together form an oxo moiety; or wherein for the compound of Formula I, R 6 and R 7 taken together with the adjacent carbons to which they are attached form a 3-membered carbocyclic ring which is optionally substituted by one or two substituents independently selected from the group consisting of halogen, hydroxyl, -C 1 -C 3 alkyl, -C 1 -C 3 alkoxy, -C NR a R b, and -NR a R b; and R P is selected, independently for each occurrence, from the group consisting of carboxy, hydroxyl, halogen, amino, phenyl, C 1-6 alkoxy, and C 1-6 alkyl optionally substituted by one or more substituents independently selected from the group consisting of halogen, hydroxyl and amino.