CC1(C)C(OC(=O)CCC(=O)[O-])CC[C@]2(C)C1CC[C@@]1(C)C2C(=O)C=C2[C@@H]3C[C@@](C)(C(=O)[O-])CC[C@]3(C)CCC21C.[Na+].[Na+]
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?