COC1=CC=C(CCOC2OC(COC(C)=O)C(OC(C)=O)C(OC3OC(COC(C)=O)C(OC(C)=O)C(OC(C)=O)C3OC(C)=O)C2OC(C)=O)C=C1OC(C)=O