CC(=O)Nc1ccc2c3c(cc(O)c2c1)N(C(=O)CCCCC(=O)N1CC(CCl)c2c1cc(O)c1cc(NC(C)=O)ccc21)CC3CCl
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?