SMILES: CC(C)C[C@@H](C(=O)N[C@@H](CO)C(=O)N[C@@H](CC1=CN=CN1)C(=O)N[C@@H](CCCC[NH3+])C(=O)NCC(=O)N2CCC[C@H]2C(=O)N[C@@H](CCSC)C(=O)N3CCC[C@H]3C(=O)N[C@@H](CC4=CC=CC=C4)C(=O)[O-])NC(=O)[C@H](CCC[NH+]=C(N)N)NC(=O)[C@@H]5CCCN5C(=O)[C@H](CCC[NH+]=C(N)N)NC(=O)[C@H](CCC(=O)N)[NH3+]
Description: The molecule is a peptide cation obtained from the protonation of the N-terminus amino group and L-arginyl side chains, and deprotonation of the C-terminus carboxy group of apelin-13. It is the major species at pH 7.3. It is a conjugate acid of an apelin-13.