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9-Hydroxy-10,11-dehydro-sarcotrocheliol ( 1 ), a new pyrane-based cembranoid diterpene, has been isolated along with three other known compounds, namely, sarcotrocheliol acetate ( 2 ), (+)-sarcophytol A ( 3 ), and (−)-sarcophytonin A ( 4 ), from the organic extract of the soft coral  Sarcophyton trocheliophorum . The chemical structures of compounds  1–4  were determined on the basis of their 1D and 2D NMR [ 1 H,  13 C,  1 H– 1 H correlation spectroscopy, heteronuclear multiple-quantum coherence, heteronuclear multiple-bond correlation, and nuclear Overhauser effect (NOE)] and mass spectra [electron ionization (EI), electrospray ionization, and high resolution mass spectrometry (HRMS)], and by comparison with related structures. The compounds  1–4  showed neither antimicrobial activity against 11 diverse tested microorganisms, nor cytotoxicity against brine shrimp, whereas the soft coral extract showed low cytotoxicity with a mortality rate of 1.7%.

Unusual pyranosyl cembranoid diterpene from Sarcophyton trocheliophorum