CC(C)NC(=O)N(C)C[C@@H]1Oc2ccc(NC(=O)CCN3CCOCC3)cc2CC(=O)N([C@@H](C)CO)C[C@@H]1C
Hydrogen bond acceptor is the chemical compound which contains the lone electron pairs that participate in the hydrogen bond formation. How many hydrogen bond acceptors does the molecule contain?