SMILES: C[C@@H]([C@@H](C1=NC2=C(NC1)N=C(NC2=O)N)O)O
Description: The molecule is a 7,8-dihydrobiopterin in which the 1,2-dihydroxypropyl group has (1R,2S)-configuration; naturally occurring form. It is an enantiomer of a D-erythro-7,8-dihydrobiopterin.