COc1cc(/C=C2/C(=O)N(C(=O)OC(C)C)C(Cc3cc(OC)c(OC)c(C)c3OC)C(=O)N2Cc2ccccc2)c(OC)c(C)c1OC
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?