property and lipase resolution ability in the development of a new resolution process for preparing optically pure carboxylic acids. With the Candida antarctica lipase B (CALB)-catalyzed hydrolysis of (R,S)-N-profenylazoles in organic solvents as the model system, (R,S)-N-profenyl-1,2,4-triazoles instead of their corresponding ester analogues were exploited as the best substrates for preparing optically