COC(=O)[C@]1(CC(C)C)N[C@H](c2ccc(SC3CCCCC3)c(OC)c2)[C@@H]2C(=O)N(C)C(=O)[C@@H]21.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?