COc1cc2ccc1NC(=O)N1CCN(CC1)C(=O)Nc1ccc(cc1OC)-c1ccc(c(OC)c1)NC(=O)N1CCN(CC1)C(=O)Nc1ccc-2cc1OC
The electronegative atoms usually involved in hydrogen bonding are oxygen, nitrogen and fluorine. How many hydrogen bond acceptors does the molecule contain?