CCN1CCN(Cc2ccc(NC(=O)c3ccc(C)c(NC(=O)C[C@@H]4NC(=O)[C@H](Cc5ccccc5)NC4=O)c3)cc2C(F)(F)F)CC1
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?