CC1CCCN(CCCN2C(=O)C3C(C(=O)Nc4ccc(Cl)cc4)C4C=CC3(O4)C2C(=O)NC2CCCCC2)C1
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?