CCN(C[C@H]1N[C@@](CC)(C(=O)OC)[C@H]2C(=O)N(Cc3ccccc3)C(=O)[C@@H]12)S(=O)(=O)c1ccc(-c2ccccc2)cc1.O=C(O)C(F)(F)F
The electronegative atoms usually involved in hydrogen bonding are oxygen, nitrogen and fluorine. How many hydrogen bond acceptors does the molecule contain?