| 摘要 |
A compound of general formula (I): wherein Xi is H or COR1 and X2 is H or COR2 but X1 and X2 are not both H; R1 and R2 are the same or different and are each C1-4 alkyl substituted with R3, or a four to seven-membered ring wh ich can be optionally substituted with R8 and can contain one or more additi onal heteroatoms selected from O, S(O)n and NR9; R3 is F, CF3, OR4, NR5R6 or S(O)nR7; R4, R5 and R6 are the same or different and are each H or C1-4 alk yl optionally substituted with R3, or NR5R6 is a C4-6 heterocycloalkyl ring containing one or more heteroatoms selected from O, NR8 and S(O)n; each n is 0-2; R7 is C1-4 alkyl; R8 is as defined for R3 or C1-4 alkyl optionally sub stituted with R3 or halogen; R9 is H or C1-4 alkyl; Y is NR9R10R11; and R10 and R11 are the same or different and are each H or C1-6 alkyl optionally su bstituted with R3 or halogen, or NR10R11 is a four to seven membered ring wh ich can be optionally substituted with R8 or COR1, and can contain one or mo re additional heteroatoms selected from O, S(O)nand NR9; and hydrates thereo f.
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