| 摘要 |
A compound of formula (I) wherein R1 is phenyl substituted by one or more halogen atoms; R2 is -NH2; R3 is -NH2 or hydrogen; R4 is -CXNRaRb, -CXNH-(CH2)y-NRaRb; wherein X is =O or +S; y is an integer zero, 1 or 2; Ra and Rb, which may be the same or different, are selected from hydrogen and C1-4 alkyl or together with the nitrogen atom to which they are attached form a saturated 5- or 6-membered heterocycle containing one or two nitrogen heteroatoms, which heterocycle can be further substituted with one or more C1-4 alkyl groups; and pharmaceutically acceptable derivatives thereof.
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