CC(=O)N(C(C)=O)C1=C2c3ccccc3N(S(=O)(=O)c3ccccc3)C2n2c(=O)n(-c3ccccc3)c(=O)n2C1
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?