CC(C)[C@H]1NC(=O)[C@H]2N=C(S[C@H]2C)[C@@H]2CCCN2C(=O)[C@H](Cc2ccccc2)NC(=O)[C@@H]2CSC(=N2)[C@@H](Cc2ccccc2)NC(=O)[C@@H]2CSC1=N2
The electronegative atoms usually involved in hydrogen bonding are oxygen, nitrogen and fluorine. How many hydrogen bond acceptors does the molecule contain?