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Two new dihydroagarofuran sesquiterpenes with a novel substitution pattern:1α-(α-methyl)-butanoyl-2α,15-diacetoxy-4β-hydroxy-9β-(β-)furancarboxy-β-dihydroagarofuran (1) and 1α,2α-di-(α-methyl)-butanoyl-4β-hydroxy-9β-(β-)furancarboxy-15-acetoxy-β-dihydro-a