Abstract
The acyclic C₁₉ and C₂₀
isoprenoid hydrocarbons, pristane (Pr) and phytane (Ph), respectively, have been widely assumed to be diagenetic products of the phytyl side chain of chlorophyll¹⁻³, although alternative sources of precursors have been suggested. The ratio of these two compounds is usually interpreted to be an indicator of the
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