NCCC[C@@H](CC(=O)N[C@@H]1CCCC[C@H]1C(=O)N[C@H](CC(=O)N[C@@H](CCC(=O)O)CC(=O)O)Cc1c[nH]c2ccccc12)NC(=O)C[C@H](CO)NC(=O)[C@@H]1CCCC[C@H]1N
Please calculate the molecule's mass based on standard atomic weight.