O=C(C[C@H]1C/C=C\C[C@@H](Cc2ccc(F)cc2)C(=O)OC[C@@H](Cc2c[nH]c3ccccc23)NC1=O)NCCO
Hydrogen bond acceptor is the chemical compound which contains the lone electron pairs that participate in the hydrogen bond formation. How many hydrogen bond acceptors does the molecule contain?