The structures of six Chlorobium chlorophylls (650) have been determined. The pheophorbides are derivatives of 2-desvinyl-2-α-hydroxyethyl pyropheophorbide a. Variation of the substituents at C4 (isobutyl, n-propyl, or ethyl) and C5 (ethyl or methyl) accounts for the six different compounds.
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Purdie et al. (1965) studied this question.
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