Synthetics
Acetoin butyrate smells like a sweet, buttery, and slightly fruity flavoring ingredient.
Mosciano, Gerard P&F 21, No. 1, 33, (1996): Creamy, musty and buttery
Luebke, William tgsc, (2009): Fruity cheese acetic creamy dried berry butter
Alfrebro: Fruit, cheese, sweet, red berry