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Details are given of the ultraviolet, optical rotatory dispersion and fluorescence spectra of oxoformycin. The pK of formation of the monoanion is 8.6, at 25 °C. As formycin B has the same pK value, the ionization of both compounds is ascribed to dissociation of a proton from N-1. Both the neutral and monoanionic forms of oxoformycin are strongly fluorescent.

The Ionization and Optical Properties of Oxoformycin