C=CC[C@@H](CC(=O)OC(C)(C)C)C(=O)OC[C@H](Cc1c[nH]c2ccccc12)NC(=O)[C@H](CC=C)CC(=O)N[C@H](CO)Cc1ccccc1
Hydrogen bond acceptor is the chemical compound which contains the lone electron pairs that participate in the hydrogen bond formation. How many hydrogen bond acceptors does the molecule contain?