Showing structure for OC(=O)C(=C1/OC(=O)C(=C1O)C1=CC2=C(C=C1)C(=O)C(=O)C=C2C1=C(O)\C(OC1=O)=C(/C(O)=O)C1=CC=C(O)C=C1)\C1=CC=C(O)C=C1