CCOc1ccc(CCN2C(=S)N([C@@H](CC(C)C)CN3CCCC3CN3C(=S)NC[C@@H]3Cc3ccc(O)cc3)C[C@@H]2Cc2ccc(O)cc2)cc1
The electronegative atoms usually involved in hydrogen bonding are oxygen, nitrogen and fluorine. How many hydrogen bond acceptors does the molecule contain?