CC(C)(C)N1C(=O)[N-]/[N+](=C(C(/c2ccccc2)=[N+]2/[N-]C(=O)N(C(C)(C)C)C2=O)\c2ccccc2)C1=O
The electronegative atoms usually involved in hydrogen bonding are oxygen, nitrogen and fluorine. How many hydrogen bond acceptors does the molecule contain?