CC(C)n1c(O)c(C2c3cc(Cl)ccc3Oc3[nH]c(=O)n(C(C)C)c(=O)c32)c(=O)[nH]c1=O.N
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?