COc1ccc(COC(=O)N/N=C2/C[C@@H](O)[C@@H](O)[C@@H]3[C@@H]4C(=O)N([C@@H](C)c5ccccc5)C(=O)[C@H]4CC[C@@H]23)cc1
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?