| 主权项 |
1. A compound of Formula (I) or a pharmaceutically acceptable salt thereof: wherein R1 and R2 are independently H or F; R3 is OR5 and R4 is H, or R3 is H and R4 is OR5; each R5 is independently H or C1-6 acyl; R6 is H, F, or OR5; R7 is selected from the group consisting of: H, F, C1-8 alkyl, C2-8 alkenyl, and C2-8 alkynyl, wherein the C1-8 alkyl, C2-8 alkenyl, or C2-8 alkynyl are optionally substituted from one up to the maximum number of substituents with one or both of fluoro or OH; R8 is selected from the group consisting of: C1-8 alkyl, C2-8 alkenyl, C2-8 alkynyl, C3-6 cycloalkyl, aryl and heteroaryl, optionally substituted from one up to the maximum number of substituents with fluoro or OH; each R9 is independently selected from the group consisting of: H, C1-6 alkyl, C3-6 alkenyl, C3-6 alkynyl, and C1-6 alkoxy, wherein the C1-6 alkyl, C3-6 alkenyl, C3-6 alkynyl, or C1-6 alkoxy are optionally substituted from one up to the maximum number of substituents with one or more of fluoro, OH, or methyl, or the two R9 groups are connected together with the nitrogen atom to which they are attached to form a ring, said ring optionally independently substituted from one up to the maximum number of substituents with one or more of fluoro, OH, or methyl, with the proviso that when R6 is OR5, R7 is other than F. |
