Cc1ccc(N2CCN(C(=O)c3cnn(-c4ccc(F)cc4F)c3C3CCN(C(=O)OC(C)(C)C)CC3)CC2)c(C)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?