70293-92-4 AC 8371 DIVEMA NSC46015 PC 1887 PC 1888 PYRAN POLYMER Poly[(1,3a,4,6,7,7a-hexahydro-1,3-dioxo-3H-furo[3,4-c]pyran-4,6-diyl)(tetrahydro-2,5-dioxo-3,4-furandiyl)methylene] Poly[1,3a,4,6,7,7a-hexahydro-1,3-dioxo-3H-furo[3,4-c]pyran-4,6-diyl][tetrahydro-2,5-dioxo-3,4-furandiyl]methylene SKI 28420