from the results of high performance liquid chromatography , oxidative degradation , and gas chromatography-electron impact mass spectrometry , their structures were identified as 7- ( d-erythro-1',2',3'-trihydroxypropyl ) -pterin ( 7-neopterin ) , 7- ( l-erythro-1',2'-dihydroxypropyl ) -pterin ( 7-biopterin ) , and 6-oxo-7- ( l-erythro-1',2'-dihydroxypropyl ) -pterin ( 6-oxo-7-biopterin ) .
C0068527
neopterin
C0005562
biopterin