COc1ccc2c3c1O[C@H]1C4(OC)C=CC5(C6C(=O)N(c7ccccc7)C(=O)C64)C(C2)N(C)CCC315
Hydrogen bond acceptor is the chemical compound which contains the lone electron pairs that participate in the hydrogen bond formation. How many hydrogen bond acceptors does the molecule contain?