SMILES: B([C@H](CCC[NH+]=C(N)N)NC(=O)[C@@H]1CCCN1C(=O)[C@@H](CC2=CC=CC=C2)NC(=O)C)(O)O
Description: The molecule is a guanidinium ion resulting from the protonation of the guanidino group of Ac-(D)Phe-Pro-boroArg-OH. The major species at pH 7.3. It is a conjugate acid of an Ac-(D)Phe-Pro-boroArg-OH.