The antimycobacterial activities of all compounds were evaluated in vitro against Mycobacterium tuberculosis CNCTC My 331/88, Mycobacterium kansasii CNCTC My 235/80, Mycobacterium kansasii 6509/96, and Mycobacterium avium CNCTC My 330/88. The values of MICs are generally within the range 8-500 µmol/l.