C=C1C(O)C2OC3(CCC(/C=C/C(C)C4CC(C)=CC5(OC(CC(C)(O)C(=O)O)CCC5O)O4)O3)CCC2OC1C(O)CC(C)C1OC2(CCCCO2)CCC1C
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?