The present invention provides bicyclo[3.2.1]octyl amide derivatives of formula (I): wherein L, R1 and R2 are as defined herein, or a pharmaceutically accep 表 salt thereof; and pharmaceutical compositions and methods using the same.本發明提供式(I)之雙環[3.2.1]辛基醯胺衍生物:其中L、R1及R2如本文所定義;或其醫藥學上可接受之鹽;及使用彼之醫藥組成物及方法。