O=C1CC(=O)N(Cc2ccccc2)C(=O)N1CCCCCCN1C(=O)CC(=O)N(Cc2ccccc2)C1=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?