C/C(CCN1CCc2nc(-c3ccccc3)c(-c3ccccc3)cc2C1)=N\O[C@@H](C)c1cn([C@@H]2COC[C@@H]2O)nn1
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?