A spectral study was carried out of the green pigments produced by allyl-containing drugs and a comparison made with N-methylated octaethylporphyrin and 2,4-diformyldeuteroporphyrin. The green pigments resemble the former (and markedly differ from the latter) in the intensity of the bathochromic shifts, titration curves with trifluoroacetic acid and rate of incorporation of metal ions in vitro.

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