C=CCN1C(=O)/C(=C/c2ccc(Cl)cc2)N=C1SC1OC(COC(C)=O)C(OC(C)=O)C(OC(C)=O)C1OC(C)=O
The electronegative atoms usually involved in hydrogen bonding are oxygen, nitrogen and fluorine. How many hydrogen bond acceptors does the molecule contain?