Figure 2From: The nature and fate of natural resins in the geosphere. Part X.† Structural characteristics of the macromolecular constituents of modern Dammar resin and Class II ambers1D 1H NMR spectra for modern (a) and fossil (b) Dammar polymers. Details of olefinic proton resonances are inset for clarity (* = CHCl3). See Additional file 1 for interactive NMR spectra for (a) and (b).Back to article page