The present invention is directed to Buprenorphine Analog compounds of Formula I, II or III and including various stereoisomers (such as Formula IA shown below), wherein R1, R3a, R3b, R16, R15, G, Q, X, and Z are as defined herein. Compounds of the Invention are useful for treating pain, constipation, and other conditions modulated by activity of opioid and ORL-1 receptors.本發明關於式I、II或III之丁基原啡因(buprenorphine)類似化合物及包括各種立體異構物(諸如下文所示之式IA),其中R1、R3a、R3b、R16、R15、G、Q、X和Z係如本文中所定義。本發明化合物可用於治療疼痛、便秘及由類鴉片和ORL-1受體的活性調節之其他病況。