CC#CCN1c2ccccc2[C@]23C[C@@H](C(=O)OC)N(C(C)=O)C2=NC(C(=O)OC)=C(C(=O)OC)[C@H]13
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?