| 摘要 |
The present invention relates to a compound represented by formula (I) wherein R<SUP>1 </SUP>represents optionally protected hydroxy or oxo, <img id="custom-character-00001" he="3.13mm" wi="7.79mm" file="US20070167522A1-20070719-P00001.TIF" alt="custom character" img-content="character" img-format="tif"/> indicates alpha-configuration, beta-configuration or a mixture of these in an arbitary proportion, n represents an integer of 1 to 3, and m represents 0 or an integer of 1 to 10; and wherein two or more R<SUP>1</SUP>'s are not bound to the same carbon atom other than the terminal carbon atom, a salt thereof or a prodrug thereof. The compounds represented by formula (I) have an ability to improve astrocyte function, and they are useful as a preventive and/or therapeutic agent for a brain infarction, neuronal dysfunction by brain infarction, Parkinson's disease, Parkinson's syndrome, amyotrophic lateral sclerosis or Alzheimer's disease.
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