COc1ccc(CNC(=O)C[C@H]2C[C@H](C(=O)N3CCCCC3)[C@@]3(C)c4[nH]c5cc(-c6ccco6)ccc5c4CCN3C2=O)cc1OC
The electronegative atoms usually involved in hydrogen bonding are oxygen, nitrogen and fluorine. How many hydrogen bond acceptors does the molecule contain?