Cl.NCCCCC(NC(=O)C(N)Cc1ccc(O)cc1)C(=O)NC(CCCCN)C(=O)NC(CCCCN)C(=O)ON1C(=O)CCC1=O
Hydrogen bond acceptor is the chemical compound which contains the lone electron pairs that participate in the hydrogen bond formation. How many hydrogen bond acceptors does the molecule contain?