COC(=O)C/C=C\[C@@H](C)[C@@H](/C=N\OCC[C@@H]1C=C[C@H](OC(C)=O)[C@H](COC(C)=O)O1)OC
The electronegative atoms usually involved in hydrogen bonding are oxygen, nitrogen and fluorine. How many hydrogen bond acceptors does the molecule contain?