CC(C)(C)C1CCC2c3c([nH]c4ccccc34)C3C(=O)N(c4ccc5c(c4)C(=O)c4ccccc4C5=O)C(=O)C3C2C1
The electronegative atoms usually involved in hydrogen bonding are oxygen, nitrogen and fluorine. How many hydrogen bond acceptors does the molecule contain?