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Partially reconstructed ion chromatograms from GC-MS analyses of Murchison hydropyrolysis products. Numbers indicate the position of methyl substituents. (a) the naphthalenes (m/z 128 + 142 + 156), (b) the phenanthrenes (m/z 178 + 192), and (c) the pyrenes (m/z 202 + 216) released upon hydropyrolysis of Murchison.
