COC(=O)C1=C(C(=O)OC)[C@]2([C@H]3C/C=C\CN[C@@H](Cc4ccccc4)C(=O)N3Cc3ccccc3)C=C[C@H]1O2
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?