| 摘要 |
Compounds useful as antiproliferative agents, radioprotective agents and cytoprotective agents, including, for example, anticancer agents, are provided according to formula I: wherein ring A, ring B,<img id="CUSTOM-CHARACTER-00001" he="2.79mm" wi="7.03mm" file="US07482488-20090127-P00001.TIF" alt="custom character" img-content="character" img-format="tif"/>,X, R1, R2, R3, a, and b are as defined herein.
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