7-tert-Butylfascaplysin
7-tert-Butylfascaplysin (7-TB) is a derivative of Fascaplysin (HY-112328), that can be isolated from Fascaplysinopsis sp.. 7-tert-Butylfascaplysin induces replication stress, leads to toxic DNA double-strand breaks and apoptosis-like cell death, and thus exhibits cytotoxicity in cancer cells in nanomolar levels. 7-tert-Butylfascaplysin exhibits DNA intercalating activity with EC50 of 3.2 μM.