CCCCN1C(=N)N([C@@H](CN2CCC[C@H]2CN2C(N)=NC[C@@H]2Cc2ccccc2)C(C)C)C[C@H]1Cc1ccccc1
The electronegative atoms usually involved in hydrogen bonding are oxygen, nitrogen and fluorine. How many hydrogen bond acceptors does the molecule contain?