Cc1ccc(OCc2ccc(C(=O)Nc3c(C)nn(Cc4c(F)c(F)c(F)c(F)c4F)c3C)o2)c([N+](=O)[O-])c1
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?