COc1cccc(-c2ccc3c4c2O[C@H]2c5[nH]c6ccccc6c5C[C@@]5(O)[C@@H](C3)N(CC3CC3)CC[C@]425)c1.Cl
The electronegative atoms usually involved in hydrogen bonding are oxygen, nitrogen and fluorine. How many hydrogen bond acceptors does the molecule contain?