Two new strongylophorine derivatives, along with six known strongylophorines, were isolated from the marine sponge Petrosia corticata as proteasome inhibitors. Of these, a hemiacetal mixture of strongylophorines-13/-14 was the strongest inhibitor of the proteasome with an IC50 of 2.1 μM.

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doi.org/10.1016/j.bmcl.2015.04.075
Bioorganic & Medicinal Chemistry Letters
Staff publications

Noda, Ai, Sakai, Eriko, Kato, Hikaru, Losung, Fitje, Mangindaan, Remy E.P., de Voogd, N., Yokosawa, Hideyoshi& Tsukamoto, Sachiko. (2015). Strongylophorines, meroditerpenoids from the marine sponge Petrosia corticata, function as proteasome inhibitors. Bioorganic & Medicinal Chemistry Letters, 25(13), 2650–2653.https://doi.org/10.1016/j.bmcl.2015.04.075