CCCOc1ccc(C(=O)N2CC3(CC(c4cccc(NC(=O)[C@@H]5CCC(=O)N5)c4)=NO3)C[C@H]2C(=O)NC2(C(N)=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?