COc1ccc2[nH]c3c(c2c1)CCN1C(=O)C(CC(=O)NCCCn2ccnc2)C[C@H](C(=O)N2CCOCC2)[C@@]31CCC1CCCC1
The electronegative atoms usually involved in hydrogen bonding are oxygen, nitrogen and fluorine. How many hydrogen bond acceptors does the molecule contain?