595850 Disclosed is a compound of formula I, or a pharmaceutically acceptable salt thereof, wherein the variables are defined herein. Such compounds possess both muscarinic receptor antagonist and [beta]2 adrenergic receptor agonist activities. The invention also relates to pharmaceutical compositions comprising such compounds, processes and intermediates for preparing such compounds, and methods of using such compounds as bronchodilating agents to treat pulmonary disorders. Specific embodiments of the compound include: biphenyl-2-ylcarbamic acid 1-[2-({ 3-[2-(3-{ (S)-2-[(R)-2-hydroxy-2-(8-hydroxy-2-oxo-1,2-dihydroquinolin-5-yl)ethylamino]propyl} phenyl)acetylamino]propyl} methylcarbamoyl)-ethyl]piperidin-4-yl ester, and 1-{ 2-[(4-{ [2-(3-{ (R)-2-[(R)-2-hydroxy-2-(8-hydroxy-2-oxo-1,2-dihydroquinolin-5-yl)ethylamino]propyl} phenyl)ethylcarbamoyl]methyl} phenyl)-methylcarbamoyl]ethyl} piperidin-4-yl ester.
