CO/N=C(\C(=O)[N-]n1cn[n+](CC(=O)OC(C)(C)C)c1)c1csc(NC(c2ccccc2)(c2ccccc2)c2ccccc2)n1
The electronegative atoms usually involved in hydrogen bonding are oxygen, nitrogen and fluorine. How many hydrogen bond acceptors does the molecule contain?