1,1'-[9H-Fluoren-9-ylidenebis[4,1-phenyleneoxy(2-hydroxy-3,1-propanediyl)]]2-propenoatepolymerwith[5,5'-biisobenzofuran]-1,1',3,3'-tetronChemicalbooke,3a,4,7,7a-tetrahydro-1,3-isobenzofurandioneand1,1'-[9H-xanthen-9-ylidenebis[4,1-phenyleneoxy(2-hydroxy-3,1-propanediyl)]]di-2-propenoate