Elassovalene

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| ImageFile = Elassovalene.svg

| ImageSize = 120px

| PIN = 2a,2a¹-Dihydrocyclopenta[cd]azulene

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| Section1 = {{Chembox Identifiers

| CASNo = 38310-40-6

| ChemSpiderID = 125478

| PubChem = 142246

| UNII = 5HK24EQ36P

| SMILES = C1=CC=C2C=CC3C2C(=C1)C=C3

| StdInChI= 1S/C12H10/c1-2-4-10-6-8-11-7-5-9(3-1)12(10)11/h1-8,11-12H

| StdInChIKey = HXHFTTRCEKEWIZ-UHFFFAOYSA-N

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| Section2 = {{Chembox Properties

| C=12|H=10

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| Section3 = {{Chembox Hazards

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Elassovalene (2a,8b-dihydro-cyclopent[cd]azulene) is a polycyclic hydrocarbon with chemical formula C₁₂H₁₀, composed of one cycloheptatriene ring and two fused cyclopentene rings.{{Cite book|title=Organic Chemistry: The Name Game: Modern Coined Terms and Their Origins|last1=Nickon|first1=Alex|last2=Silversmith|first2=Ernest F.|publisher=Elsevier|year=2013|isbn=978-1483145235|location=|pages=297|quote=}}