Coelodiol and coeloic acid, ent-isocopalane diterpenes from the Indonesian sponge Coelocarteria cfr. singaporensis - Fattorusso, E; Romano, A; Taglialatela-Scafati, O; Bavestrello, G; Bonelli, P; Calcinai, B (Tetrahedron Lett, 2006)