O=C(NCCC[C@H]1CN2C(=NC[C@@H]2Cc2ccc(O)cc2)N1CCc1ccc(Cl)c(Cl)c1)C1CCC1
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?