COC1=C(N)C(=O)C2=C(CCC(c3nc(C(=O)O)c(C)c(-c4ccc(OC)c(OC)c4O)c3N)N2)C1=O
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?