COc1ccc2c(c1)OC[C@H]1[C@H]2N2C(=O)c3cc(C)ccc3NC(=O)[C@@]2(C)[C@H]1c1ccccc1
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?