“…1, IV–VI ), are widely present in bioactive compounds, natural products, drug candidates, and materials. 1 Ianthellidone G ( I ), a candidate of BACE inhibitors, was isolated from a southern Australian marinesponge, ianthella sp. 2 Strchnistenolide A ( II ) was obtained from the root of Lindera strychnifolia , which has an inhibitory effect on nitric oxide production in RAW 264.7 cells.…”