SMILES: C[C@@H]([C@@H](C1=CN=C2C(=N1)C(=O)NC(=N2)N)O)O
Description: The molecule is a biopterin in which the 1,2-dihydroxypropyl group has (1R,2S)-configuration; naturally occurring form. It is an enantiomer of a D-erythro-biopterin.