Zyzzyanone A, a novel pyrrolo[3,2-f]indole alkaloid from the Australian marine sponge Zyzzya fuliginosa

A new dipyrroloquinone, zyzzyanone A 1, having a pyrrolo3,2-f]indole-4,8(1H,7H)-dione skeleton, was isolated from the Australian marine sponge Zyzzya fuliginosa, along with the known pyrroloquinoline alkaloids, makaluvamines C, E, G, H, and L, and damirones A and B. The structure of 1 was determined by spectroscopic data. Zyzzyanone A 1 shows moderate cytotoxic activity against mouse Ehrlich carcinoma cells (IC₅₀ 25 μg/mL), inhibits the cell division of fertilized sea urchin eggs at a concentration of 25 μg/mL, and exhibits UV-A and UV-B absorbing activity.