SMILES: C1=CC(=CC=C1CCNC(=O)CC[C@@H](C(=O)[O-])NC(=O)CC[C@@H](C(=O)[O-])NC(=O)CC[C@@H]([C@@H](CCC(=O)[O-])C(=O)[O-])C(=O)[O-])OCC2=COC(=C2)C[NH3+]
Description: The molecule is tetraanion of methanofuran arising from deprotonation of all five carboxy groups and protonation of the amino group; major species at pH 7.3. It is a conjugate base of a methanofuran.