CCCN(CCC)CC(O)CN1C(=O)N(CN2C(=O)N(CC(O)CN(CCC)CCC)C(=O)C2(C)C)C(C)(C)C1=O
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?