O=C(Nc1cc(C(F)(F)F)ccc1Cl)C(=O)C(C(=O)c1ccc2ccccc2c1)C1OC(=O)c2ccccc21
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?