C=CC[C@@H](CC(=O)N[C@@H](CO)Cc1ccccc1)C(=O)N[C@H](COC(=O)[C@@H](CC=C)CC(=O)OC(C)(C)C)Cc1ccccc1
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?