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The sponge Hamigera tarangaensis has yielded eight new compounds and we report here the structure of one of these compounds, hamigeran A, C20H25BrO5, or methyl 7-bromo-4β,6-di­hydroxy-1β-iso­propyl-3aα,8-di­methyl-5-oxo-1a,3a,4,5-tetra­hydro­cyclo­penta­[a]­naphthalene-4-carboxyl­ate, and the decomposition product of hamigeran D, C21H28BrNO4, namely 2-(8-bromo-2β,7-di­methyl-4-oxo-1,3α-benzox­aza­n-5-yl)-3-iso­propylcyclo­pentyl­acetic acid.
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