CCN1C(C)=C(C(=O)OC)C(c2ccccc2)N2C(=O)[C@](O)(C(=O)OC)C(c3ccccc3)C(C(=O)c3ccccc3)=C12
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?