Abstract
Determination of the absolute stereochemistries of the major acyclic isoprenoid-type acids in a sediment of Eocene age (the Green River Shale, Colorado, ca. 50 × 106 years) by g.l.c. analysis of the methyl and (–)methyl esters, indicates that the phytyl side chain of chlorophyll is the major ultimate precursor of the acids.
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