CC(C)[C@@]1(NC(=O)[C@@H]2C[C@H]3c4cccc5[nH]cc(c45)C[C@@H]3N(C)C2)O[C@]2(O)[C@H]3CCCN3C(=O)CN2C1=O.CS(=O)(=O)O
The electronegative atoms usually involved in hydrogen bonding are oxygen, nitrogen and fluorine. How many hydrogen bond acceptors does the molecule contain?