| http://www.w3.org/ns/prov#value | - above, comprising a step of; [0041] mixing a poly(imidazolylporphyrin) having a mercapto group at one end thereof, which is represented by a formula (f): [0042] wherein each of R1, R2, Im including R3 and M has the same meaning as defined in the general formula (1); and n is an integer of 0 or more, and a imidazolylporphyrin-quinonylporphyrin dimer represented by a formula (g): [0043] wherein each
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