CCO.C[C@H]1c2cccc(O)c2C(=O)C2=C(O)[C@]3(O)C(O)=C(C(N)=O)C(=O)[C@@H](N(C)C)C3[C@@H](O)C21.Cl.O
The electronegative atoms usually involved in hydrogen bonding are oxygen, nitrogen and fluorine. How many hydrogen bond acceptors does the molecule contain?