Abstract
Two spatane diterpenes, the new 5 ( R ),16 ( S )-diacetoxyspata-13,17-diene and the known 5 ( R ),16 ( S )-dihydroxyspata-13,17-diene have been isolated from the brown alga Stoechospermum marginatum . The structures were elucidated from chemical and spectroscopic evidence. The absolute stereochemistry was determined using the modified Moshers method.
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