CC[C@]1(Cc2ccc(OC)c(OC)c2)C=[N+]([O-])O[C@H](OC2CCCCC2c2ccccc2)[C@@H]1OC(C)=O
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?