CN(C)CCCNC(=O)CC1C[C@H](C(=O)N2CCCCC2)[C@@]2(CCc3ccccc3)c3[nH]c4ccccc4c3CCN2C1=O
The electronegative atoms usually involved in hydrogen bonding are oxygen, nitrogen and fluorine. How many hydrogen bond acceptors does the molecule contain?