| 摘要 |
<p>MJ-592 A series of non-oplate analgesics of Formula I wherein R1 is hydrogen, alkyl, aralkyl, or aryloxyalkyl; R2 is alkyl or hydrogen; and R3 and R4 are independently selected from hydrogen, alkyl, acyloxy, alkoxy, alkylthio, halogen, hydroxyl, or trifluoromethyl; or a pharmaceutically acceptable acid addition salt.</p> |
