O=C(Cn1c(=O)n(-c2ccc(Cl)cc2)c(=O)c2c3c(sc21)CCCCC3)Nc1cccc(Cl)c1
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?