CO[C@@H]1COC(=O)[C@H](COCc2ccccc2)NC(=O)C/C=C\[C@@H](C)[C@H](OC)COC(=O)[C@H](COCc2ccccc2)NC(=O)C/C=C\[C@H]1C
The electronegative atoms usually involved in hydrogen bonding are oxygen, nitrogen and fluorine. How many hydrogen bond acceptors does the molecule contain?