COc1ccc2[nH]c3c(c2c1)CCN1C(=O)C(CC(=O)NCCCN(C)C)C[C@H](C(=O)N2CCCCC2)[C@@]31CCc1ccccc1
The electronegative atoms usually involved in hydrogen bonding are oxygen, nitrogen and fluorine. How many hydrogen bond acceptors does the molecule contain?