O=C(C[C@H]1C/C=C\C[C@H](NC(=O)OCC2c3ccccc3-c3ccccc32)C(=O)OC[C@@H]2CCCN2C1=O)N[C@H](CO)Cc1ccccc1
The electronegative atoms usually involved in hydrogen bonding are oxygen, nitrogen and fluorine. How many hydrogen bond acceptors does the molecule contain?