COc1c2c(c(C)c3c1C(=O)OC3)O[C@@]1(C)CC[C@@]3(O)C(C)(C)OC(=O)CC[C@]3(C)[C@H]1C2
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?