The present invention is directed to Buprenorphine Analog compounds of Formula I, II, III, IV or V and including various stereoisomers (such as Formula IA shown below), wherein R1, R3a, R3b, R16, R15, G, Q, X, A and Z are as defined herein. Compounds of the Invention may be useful for preparing medicaments useful for treating pain, constipation, and other conditions modulated by activity of opioid and ORL-1 receptors. Compounds of the Invention may be useful for treating Conditions such as pain, constipation, and others modulated by activity of opioid and ORL-1 receptors.
