smiles:C1=CC(=C(C(=C1)O)O)/C=C/C(=O)O

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Both stereoisomers, in three dimensions

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The one double bond here could take either configuration. (E) and (Z) differ in which side of the double bond the substituents sit on, and the bond cannot rotate to interconvert them.

(E)what you asked for

(Z)

Isomers of C₉H₈O₄

first 48 found

Same atoms, joined differently. Every one of these is a separate compound with its own boiling point, smell and reactions. These are the ones PubChem has on file, which for a larger formula is fewer than the number that could exist on paper.

Isomers of C₉H₈O₄

Both stereoisomers, in three dimensions

Drag a model to turn it, or tab to it and use the arrow keys

The one double bond here could take either configuration. (E) and (Z) differ in which side of the double bond the substituents sit on, and the bond cannot rotate to interconvert them.

(E)what you asked for

(Z)

Both stereoisomers, in three dimensions

Isomers of C9H8O4

Isomers of C9H8O4

Both stereoisomers, in three dimensions

Isomers of C9H8O4

Isomers of C₉H₈O₄

Isomers of C₉H₈O₄

Isomers of C₉H₈O₄