| 摘要 |
A compound of formula I: and isomers, salts, solvates, chemically protected forms, and prodrugs thereof, wherein: R<1 >and R<2 >together form, along with the nitrogen atom to which they are attached, an optionally substituted heterocyclic ring having from 4 to 8 ring atoms; and R<N1 >is selected from hydrogen, an optionally substituted C1-7 alkyl group, an optionally substituted C3-20 heterocyclyl group, an optionally substituted C5-20 aryl group, an acyl group, an ester group and an amido group, and its use as a pharmaceutical.
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