acetylacetone

from The Century Dictionary.

• noun A compound, CH₃COCH₂-COCH₃, formed by the action of sodium on a mixture of acetone and ethyl acetate. It is a liquid which boils at 137° C.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun organic chemistry The diketone CH3COCH2COCH3 used as a solvent and as a coordination ligand