O=C(N[C@H]1C/C=C\C[C@@H](CC(=O)N(CCO)Cc2ccccc2)C(=O)N2CCC[C@H]2COC1=O)OCC1c2ccccc2-c2ccccc21
The electronegative atoms usually involved in hydrogen bonding are oxygen, nitrogen and fluorine. How many hydrogen bond acceptors does the molecule contain?