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A bromination at the C20-position was requisite for the cyclization of a 1-hydroxyethyl or vinyl group at the C3-position of methyl bacteriopheophorbide- d  or methyl pyropheophorbide- a , respectively. By comparing optical properties of the cyclized product with those of its 3-ethyl uncyclized analog in a diluted dichloromethane solution, it was shown that the cyclization shifted the Q x  and B x  absorption maxima to longer wavelengths and reduced the Stokes shift."}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1381694367181812353","@type":"Researcher","foaf:name":[{"@value":"Marie 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