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