... Volume: Page: ... Many natural products, such as combretastatin A-4 5 (3), podophyllotoxin (4), or the epothilones, 6 as well as some more synthetic compounds including thienopyrrolizinone 7 (5), acridinyl-9-carboxamide D-82318 8 (6), indolinone A-432411 9 (7 ...