Muscarinic M2 antagonists: anthranilamide derivatives with exceptional selectivity and in vivo activity. - Clader JW; Billard W; Binch H 3rd; Chen LY; Crosby G Jr; Duffy RA; Ford J; Kozlowski JA; Lachowicz JE; Li S; Liu C; McCombie SW; et al. (Bioorganic & medicinal chemistry, 2004)