Because the three methanolic extracts were each prepared from a random composite of 10 pellets of the same material (Instamorph pellets), as a representative sample, only one DCMreconstituted methanolic extract (sample one, Table ) was analyzed by GC×GC. The extraction blank was analyzed as well. Samples were analyzed by GC×GC-FID and GC×GC-HRT using published methods routine to the Organic Geochemistry Analysis Laboratory -GC×GC Facility at the Woods Hole Oceanographic Institution. Chromatographic peaks were tentatively identified based on mass spectral matches (above 80% similarity; NIST/EPA/NIH 20 Mass Spectral Library) and mass spectral interpretation. See the Supporting Information for complete methods.