C[C@@H](C(=O)Nc1ccc2ccccc2c1)[C@@H]1C[C@@]1(C)[C@@H](NS(=O)(=O)c1ccc(-c2ccccc2)cc1)c1ccccc1
The electronegative atoms usually involved in hydrogen bonding are oxygen, nitrogen and fluorine. How many hydrogen bond acceptors does the molecule contain?