CC(NC(=O)C(Cc1ccc(OCC[N+](C)(C)C)cc1)NC(=O)OC(C)(C)C)C(=O)NC(Cc1ccccc1)C(=O)NCC(N)=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?