Cc1ccc(S(=O)(=O)N2C[C@H]3n4c(=O)ccc(=O)n4C[C@H](OC(=O)NCC4CCCCC4)[C@@]3(O)C2)cc1
The electronegative atoms usually involved in hydrogen bonding are oxygen, nitrogen and fluorine. How many hydrogen bond acceptors does the molecule contain?