And the isoloxazine ring in this flavin mononucleotide is the same exact isoxazine ring that is found in Fad molecules. Remember, Fad stands for flavin adenineucleotide. And we find Fad in the citric acid cycle, and the Fad is able to extract those two electrons in the same exact way that FMN is able to use this same isoloxazine ring to actually extract those two electrons. But the two electrons cannot actually bind onto the FMN by themselves. They need two H plus ions. So we have two H plus ions and two electrons.