OH OHOH H,CC-C-C-CH2—( HHH O—P=O N N NH2 O-P-ON FMN,flavin mononucleotide H,C5 黄素单核苷酸 FAD,flavin adenine dinucleotide 黄素腺嘌呤二核苷酸 OH OH VB2+ATP→FMN+ADP FMN+ATP→FAD+PPi H2C—C—C—C—CH2OH OH OH OH H H H N N N C C O NH O CH3 CH3 -O—P=O O O- FMN，flavin mononucleotide 黄素单核苷酸 5′ N N 3′ O OH OH 1′ 2′ 4′ N N H NH2 H 9 -O—P=O O H2C FAD，flavin adenine dinucleotide 黄素腺嘌呤二核苷酸 VB2 + ATP → FMN + ADP FMN + ATP → FAD +PPi