Berlinck, R.G.S., Braekman, J.C., Daloze, D., Hallenga, K., Ottinger, R., Bruno, I., Riccio, R.: “Two new guanidine alkaloids from the mediterranean sponge Crambe crambe”, Tetrahedron Letters, 45, 6531-5 (1990).

Berlinck, R.G.S., Braekman, J.C., Daloze, D., Bruno, I., Riccio, R., Rogeau, D., Amade, P.: “Crambines C1 and C2: two further toxic guanidine alkaloids from the sponge Crambe crambe”, Journal of Natural Products, 55(4), 528-532 (1992).

Berlinck, R.G.S., Braekman, J.C., Daloze, D., Bruno, I., Riccio, R., Ferri, S., Spampinato, S., Speroni, E.: “Polycyclic Guanidine Alkaloids from the Marine Sponge Crambe crambe and Ca++ Channels Blocker Activity of Crambescidin 816”, Journal of Natural Products, 56, 1007-1015 (1993).

Related papers

Berlinck, R.G.S., Braekman, J.C., Daloze, D., Bruno, I., Riccio, R., Amade, P., Rogeau, D.: “New Biologically Active Guanidine Alkaloids from the Marine Sponge Crambe crambe”, in Guanidino Compounds in Biology and Medicine (Marescau, B., de Deyn, P., Qureshi, eds.), John Libbey, London, pags. 53-60 (1992).

Berlinck, R.G.S.: “Chromatographic Approach to Polar Compounds: Isolation of the Hydrophylic Constituents of the Marine Sponge Crambe crambe”, Química Nova, 17, 167-171 (1994).

See also the review papers about guanidine natural products.