| 摘要 |
<p>A compound of formula:
<Chemistry id="chema01" num="0001"><Image id="ia01" he="31" wi="96" file="IMGA0001.TIF" imgContent="chem" imgFormat="TIFF" /></Chemistry>
wherein
A is hydroxy, alkoxy, aryloxy, amino, alkylamino, or dialkylamino; and
Ra and Rb are independently selected from hydrogen, alkyl, aryl, heteroaryl, acyl, silyl, alkoxyacyl and aminoacyl.</p> |
