CCOP(=S)(OCC)Oc1ccc2c(c1)OC(=O)[C@]1(Cl)[C@@]2(C)[C@]2(Cl)C(=O)Oc3cc(OP(=S)(OCC)OCC)ccc3[C@]12C
The electronegative atoms usually involved in hydrogen bonding are oxygen, nitrogen and fluorine. How many hydrogen bond acceptors does the molecule contain?