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Hitoshi Tamiaki, Yukihiro Okamoto, Yuji Mikata, Sunao Shoji. "Photooxidative cleavage of zinc 20-substituted chlorophyll derivatives: conformationally P-helix-favored formation of regioselectively 19–20 opened linear tetrapyrroles." Photochemical and Photobiological Sciences 11.6 (2012) 898-907