SMILES: C1=NC2=C(N1[C@H]3[C@@H]([C@@H]([C@H](O3)COP(=O)(O)OP(=O)(O)O[C@@H]4[C@H]([C@H]([C@@H]([C@H](O4)C(=O)O)O)O)O)O)O)N=C(NC2=O)N
Description: The molecule is a GDP-D-mannuronic acid in which the anomeric centre of the mannuronic acid fragment has alpha-configuration. It is a conjugate acid of a GDP-alpha-D-mannuronate.