CC(=O)OC1CC[C@@]2(C)C(CC[C@@]3(C)C2CC=C2C4CC(C)(C)CC[C@]4(C(=O)O)CC[C@@]23C)C1(C)C
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?