COC(=O)CN1Cc2cc(C)cc(c2O)CN(CC(=O)OC)Cc2cc(C)cc(c2O)CN(CC(=O)OC)Cc2cc(C)cc(c2O)C1
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?