CSCCC(NC(=O)Cc1ccc(C(=O)c2ccccc2)cc1)C(=O)N1CCN(CCCCN2c3ccccc3Sc3cc(N=[N+]=[N-])ccc32)CC1
The electronegative atoms usually involved in hydrogen bonding are oxygen, nitrogen and fluorine. How many hydrogen bond acceptors does the molecule contain?