COCCNC(=O)c1cc2c(c(-c3cccc(-c4cc5ccccc5o4)c3)n1)[C@H](CCO)N([S+]([O-])C(C)(C)C)C2
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?