Abstract
Novel aromatic carotenoid derivatives 7 and 8 have been identified by synthesis of reference compounds in a H 2/PtO 2-hydrogenated fraction from the organic extract of a lake sediment (lake Cadagno, Switzerland). They derive from unreported carotenoids presumably biosynthesized by purple sulfur photosynthetic bacteria ( Chromatiaceae) and represent potential biomarkers to establish the occurrence of photic zone anoxia in ancient ecosystems.
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