CC(C)C[C@H]1CN([C@@H](CC(C)C)CN2CCC[C@@H]2CN2C(=O)C(=O)NC[C@@H]2Cc2ccccc2)C(=O)C(=O)N1CC1CCCCC1
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?