CCCCCCNC(=O)OC12CN(C(=O)OC(C)C)N(C(=O)OC(C)C)CC1(O)CN(S(=O)(=O)c1ccc(C)cc1)C2
The electronegative atoms usually involved in hydrogen bonding are oxygen, nitrogen and fluorine. How many hydrogen bond acceptors does the molecule contain?