CC(C(=O)N1C(=O)N(C(=O)C(C)C(O)c2ccccc2)C(c2ccccc2)C1c1ccccc1)C(O)c1ccccc1
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?