C[N+](C)(C)CC(=O)N/N=C/c1oc(-c2c(O)ccc3ccccc23)c(-c2c(O)ccc3ccccc23)c1[N+](=O)[O-].[Cl-]
The electronegative atoms usually involved in hydrogen bonding are oxygen, nitrogen and fluorine. How many hydrogen bond acceptors does the molecule contain?