CC(=O)Oc1cc2c(c(C)c1OC(C)=O)CC=C1[C@@]2(C)CC[C@@]2(C)C3C[C@](C)(C(=O)O)CC[C@@]3(C)CC[C@@]12C
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?