4,4a-alpha,5,6,7,7a-alpha-Hexahydro-4-beta,7-alpha-dimethylcyclopenta(c)pyran-3(1H)-one Cyclopenta(c)pyran-3(1H)-one, 4,4a-alpha,5,6,7,7a-alpha-hexahydro-4-beta,7-alpha-dimethyl- GY5836200 Irridomyrmercin