C=C(c1nc2ccc(Cl)cc2[nH]c1=O)C(O)c1ccc(C(O)C(=O)c2nc3ccc(Cl)cc3[nH]c2=O)cc1
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?