The Chlorobium chlorophylls (660) consist of six different pigments, all of which are derivatives of δ-alkyl-2-desvinyl-2-α-hydroxyethylpyropheophorbide.α The six compounds differ in their substituents at C4(isobutyl, n-propyl, ethyl), C5 (ethyl, methyl), and Cδ (ethyl, methyl).
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Holt et al. (1966) studied this question.
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