Antifouling activities of hymenialdisine and debromohymenialdisine from the sponge Axinella sp.

National Natural Science Foundation of China [41276127]; Public Science and Technology Research Funds Projects of Ocean of China [201305016]; Natural Science Foundation of Fujian Province of China [2011J01276]; Fundamental Research Funds for the Central Universities of China [2010111025, 2011121056]