CCCCCCCCCC1CC(=O)NCC(=O)NC(C(C)C)C(=O)NC(CC(C)C)C(=O)NC(C)C(=O)NC(C(C)C)C(=O)O1
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?