Connection of Isolated Stereoclusters by Combining C-RCSA, RDC, and -Based Configurational Analyses and Structural Revision of a Tetraprenyltoluquinol Chromane Meroterpenoid from .

The seaweed , collected on the southern coast of Galicia, yielded a tetraprenyltoluquinol chromane meroditerpene compound known as , whose structure is revised. The relative configuration of was determined by -based configurational methodology combined with an i/DP4 statistical analysis and further confirmed by measuring two anisotropic properties: carbon residual chemical shift anisotropies (C-RCSAs) and one-bond H-C residual dipolar couplings (-RDCs). The absolute configuration of was deduced by ECD/OR/TD-DFT methods and established as ,,.