CC(C)C[C@@H](CC(=O)N[C@@H](CCC(=O)O)CC(=O)O)NC(=O)[C@@H]1CNCC[C@H]1NC(=O)C[C@H](CCCN)NC(=O)C[C@H](CO)NC(=O)[C@@H]1CNCC[C@H]1N
Hydrogen bond acceptor: The atom, ion, or molecule component of a hydrogen bond which does not supply the bridging (shared) hydrogen atom. How many hydrogen bond acceptors does the molecule have?