CC[C@H](C)[C@@H](C(=O)NCCCCCCCCCCC(=O)N1CCN(C(=O)OC(C)(C)C)CC1)n1cc(CCCCCNC(=O)OC(C)(C)C)nn1
The electronegative atoms usually involved in hydrogen bonding are oxygen, nitrogen and fluorine. How many hydrogen bond acceptors does the molecule contain?