CC[C@H](C)[C@@H](C(=O)N1CCCC1c1nccs1)N(C)C(=O)[C@H](CC(C)C)N(C)C(=O)[C@H](Cc1ccc(OC)cc1)N(C)C(=O)/C=C(\C)OC
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?