CC(C)C1=CC23CCC4C(C)(C(=O)[O-])CCCC4(C)C2CC1C1C(=O)N(c2ccc(N4C(=O)C5C6CC7C8(C)CCCC(C)(C(=O)O)C8CCC7(C=C6C(C)C)C5C4=O)cc2)C(=O)C13.[Na+]
The electronegative atoms usually involved in hydrogen bonding are oxygen, nitrogen and fluorine. How many hydrogen bond acceptors does the molecule contain?