COc1ccc(C(OCC2OC(n3ccc(NC(=O)c4ccccc4)nc3=O)CC2OP2(=S)SCCS2)(c2ccccc2)c2ccc(OC)cc2)cc1
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?