Main Reaction: biopterin- + O2 >> biopterin + O2-

Reference: PubMed ID: 20135037
Authors: Vignoni M, Cabrerizo FM, Lorente C, Claparols C, Oliveros E, Thomas AH
Title: Photochemistry of dihydrobiopterin in aqueous solution.
Published: 2010 Feb 21

biopterin- + O2 --> biopterin + O2-