Remarkable selectivity is exhibited in the photooxidation of 20-methoxychlorin methyl ester (1) to exclusively yield the C1-C20 bond cleaved product 2. This selectivity lends strong support to the hypothesis that a hydroxy or equivalent group at C20 directs the C1-C20 bond cleavage that transforms chlorophylls into krill and dinoflagellate luciferins.
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Topalov et al. (2001) studied this question.
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