| abstract |
A compound having the structure represented by the following formula (i) or a derivative thereof, the derivative being a pharmaceutically acceptable salt, N-oxide, stereoisomer, geometric isomer, tautomer, solvate or hydrate of the compound, ** (See formula ) ** in which R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, R13 and R14 in formula (i) are each independent hydrogen or deuterium, with the provided that at least one of them is deuterium. |