The oxidation of substrates by P450 is regulated by introducing an interaction site with decoy molecules into polymer hydrogels.

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It is well known that arsenazo III is a spectrophotometric analytical reagent of thorium, uranium and rareearth metal ions.l Small dissociation constants (Ka) of the hydroxyl groups (log Kalo = -15.1 and log Ka9 = -11.98) for arsenazo III have been reported.2 Bude sinsky expected the formation of intramolecular hydrogen bonds between the hydroxyl and azo group of arsenazo III based on the results of the small log Ka values. The structure of arsenazo III has not yet been reported, although the structure of the analogous arsenazo I has been reported.3 Therefore, the structure has been investigated by single-crystal X-ray diffraction. Dark-violet single crystals were grown at the interface between a 6 M hydrochloric solution and an aqueous arsenazo III solution with 10% acetone. A single crystal was enclosed within a glass capillary tube, and the X-ray reflections were collected using a Rigaku AFC7R diffractometer.