1,2-PROPADIENE,1,1,3,3-TETRACARBOXYLIC ACID,TETRAETHYL ESTER 1,2-propadiene-1,1,3,3-tetracarboxylic acid, tetraethyl ester 67761-23-3 InChI=1/C15H20O8/c1-5-20-12(16)10(13(17)21-6-2)9-11(14(18)22-7-3)15(19)23-8-4/h5-8H2,1-4H tetraethyl allene-1,1,3,3-tetracarboxylate