Cc1ccc2nc3ccccc3c(C3C4C(=O)N(c5ccc(Br)cc5Cl)C(=O)C4ON3C(C(N)=O)c3ccccc3)c2c1
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?