O=C1C=C(Nc2ccccc2C(=O)CC(=O)C(=O)Nc2cccc(C(F)(F)F)c2)c2ccccc2C1=O
Hydrogen bond acceptor: The atom, ion, or molecule component of a hydrogen bond which does not supply the bridging (shared) hydrogen atom. How many hydrogen bond acceptors does the molecule have?