N#CCCN(c1ccc(-c2nnc(NC(=O)CNNC(=O)CC(=O)Nc3ccccc3)s2)cc1)S(=O)(=O)c1ccccc1
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?