It has been demonstrated that compound 79 has a selective antiproliferation effect on the colorectal HT-29 cancer cell line, which has a high CA IX expression under ambient air (IC50 = 17.01 μM for HT-29, IC50 = 118.73 μM for embryonic kidney cell line HEK293T compared to the standard drug doxorubicine with IC50 values of 5.38 and 1.051 μM, respectively). Here, CA9 is linked to cancer.