CCCN(CCC)C(=O)Cn1c(=O)n(Cc2ccc(C(=O)NCCc3ccc(OC)c(OC)c3)cc2)c(=O)c2ccccc21
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?