CN1C2(c3ccccc3)c3c(-c4ccccc4)sc(-c4ccccc4)c3C1(c1ccccc1)C1C(=O)N(c3ccccc3)C(=O)C12
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?