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Ceylonins G–I: spongian diterpenes from the marine sponge Spongia ceylonensis
Three new spongian diterpenes, ceylonins G–I (1–3), were isolated from the marine sponge Spongia ceylonensis collected in Indonesia, together with five known spongian diterpenes (4–8). Only 4 inhibited USP7 with an IC50 value of 8.2 μM