2H-Pyrimido[4'',5'':2',3'][1,4]diazepino[6',5':3,4]pyrrolo[1,2-f]pteridine-1,12-dione,3,10-diamino-5,6,6a,6b,7,8-hexahydro-14-methyl-, trans-(+)-; Drosopterin (6CI)
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