CC1=C(C(=O)OCCc2ccc([N+](=O)[O-])cc2)C(c2ccccc2C(F)(F)F)C(C(=O)OC(C)C)=C(C)N1
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?