Gyrinidone

(E)-1-Methyl-2-formyl-3-(1-methylhex-3-ene-2,5-dione)-cyclopentane

4-(1,4a,5,6,7,7a-Hexahydro-1-hydroxy-4,7-dimethylcyclopenta[c]pyran-3-yl)-3-buten-2-one