COc1ccc(/N=C2C(=N/c3ccc(OC)cc3)\N(c3ccccc3[N+](=O)[O-])C(=S)N\2c2ccc(OC)cc2)cc1
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?