CC(=O)O[C@@H]1C[C@@]23C[C@@]24CC[C@H](OC2OCC(O)C(O)C2O)C(C)(C)[C@@H]4CC=C3[C@]2(C)C[C@@H]3OC4(C[C@@H](C)[C@@H]3[C@@]12C)OC(O)[C@@]1(C)O[C@@H]41
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?