Cc1ccc(S(=O)(=O)N[C@H](C(=O)N2CCC(C(=O)N[C@@H](CC(=O)O)C(=O)O)CC2)C(C)C)cc1
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?