abstract |
A compound having structural formula I: or its pharmaceutically acceptable salt or solvate, in which: R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, and R11 are independently selected from the group that it consists of hydrogen or deuterium; at least one of R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, and R11 is deuterium; and if R7, R8, R9, R10, and R11 are deuterium, then at least one of R1, R2, R3, R4, R5, and R6 is deuterium. |