Cc1cc2c(cc1C)[n+]([O-])c(C(=O)C/C(=N/OCCCc1ccccc1)C(=O)Nc1cc(Cl)ccc1Cl)c(C)[n+]2[O-]
The electronegative atoms usually involved in hydrogen bonding are oxygen, nitrogen and fluorine. How many hydrogen bond acceptors does the molecule contain?