CC(C)[C@@H](C(=O)N(C)[C@H](C(=O)N1CCC[C@H]1C(=O)OCc1ccccc1)C(C)C)N(C)C(=O)[C@H](Cc1ccccc1)N(C)C(=O)[C@H](NC(=O)OC(C)(C)C)C(C)C
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?