Synthetics
Methyl heptenone has no known odor.
Mosciano, Gerard P&F 22, No. 1, 57, (1997): Fruity, apple, musty, ketonic and creamy with slight cheesy and banana nuances
Luebke, William tgsc, (1985): Citrus green musty lemongrass apple
Moellhausen: Fresh, fruity, estery, citrusy; lemongrass connotation