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The 31-hydroxy group of a chlorophyll-a derivative was substituted with an acetylthio moiety and the resulting thioester was methanolyzed in the presence of a base to give its chlorin dyad covalently linked with a disulfide bond without the isolation of the corresponding 31-sulfanyl-chlorin. The thiol-type chlorin monomer was obtained by the reductive cleavage of the disulfide dyad. Its zinc complex...
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