the presence of higher ( greater than 0.2 m ) concentrations of divalent anions a2- ( hydrogenphosphate , sulfate ) is found to accelerate as well as to change entirely the course of riboflavin photolysis : instead of 10-dealkylation to yield lumichrome , intramolecular addition of the 2'-hydroxyl group is found to occur at the peri-position c ( 9 ) .
C0003075
anions
C0038720
sulfate