Cc1cccc2c(N)c3cccc(C(=O)NCC[N+]4(Cc5ccc([N+](=O)[O-])cc5)CCOCC4)c3nc12.Cl.[Cl-]
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?