A novel series of biphenylylcarbamate derivaties were synthesized and evaluated for binding to M 1, M 2 and M 3 receptors and for antimuscarinic activities. Receptor binding assays indicated that biphenyl-2-ylcarbamate derivatives had high affinities for M 1 and M 3 receptors and good selectivities for M 3 receptor over M 2 receptor, indicating that the biphenyl-2-yl group is a novel hydrophobic replacement for the benzhydryl group in the ...