| 摘要 |
<p>A compound of formula I or a pharmaceutically acceptable salt thereof or a stereoisomeric form thereof or a mixture of stereoisomeric forms thereof is described wherein: Ra is substituted or unsubstituted C1-C3 alkyl, substituted or unsubstituted aryl (4-14C), substituted or unsubstituted arylalkyl (5-20C), substituted or unsubstituted arylalkenyl (5-20C) or substituted or unsubstituted arylalkynyl (5-20); Rb is H or halogen; Rd is fluoroethyl; and Rf is H, C1-C3 alkyl, substituted or unsubstituted aryl (4-14C), substituted or unsubstituted arylalkyl (5-20C), substituted or unsubstituted arylalkenyl (5-20C) or substituted or unsubstituted arylalkynyl (5-20).</p> |
