CC(C)[C@H](NC(=O)OC(C)(C)C)C(=O)NC[C@H]1CC[C@H](C(=O)N[C@@H](Cc2ccccc2)C(=O)O)CC1
The electronegative atoms usually involved in hydrogen bonding are oxygen, nitrogen and fluorine. How many hydrogen bond acceptors does the molecule contain?