Rossinone-related meroterpenes from the Antarctic ascidian Aplidium fuegiense.

The chemical analysis of the ascidian Aplidium fuegiense resulted in the isolation of three novel meroterpenoids 2-4, structurally related to the main co-occurring known rossinone B (1). The structures of the new compounds were determined by interpretation of spectroscopic data. Compounds 1-4 were found to be selectively localized in the viscera of the ascidian.