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Three unique sesquiterpenes, named euryspongins A–C (1–3), have been isolated from the marine sponge Euryspongia sp. The absolute configuration of 1 was assigned as (4R,6R,9S) by comparing its experimental Electronic Circular Dichroism (ECD) spectrum with the calculated ECD spectra of both enantiomers, and the absolute configurations of 2, 3 and artifact 4 were suggested on the basis of that of 1...
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