Synthetics
Ethyl isovalerate smells like a sweet, fruity mix of apple, pineapple, blueberry, and butter with a touch of green and vinous notes.
Mosciano, Gerard P&F 23, No. 2, 43, (1998): Sweet, diffusive, estry, fruity, sharp, pineapple, apple, green and orange
Luebke, William tgsc, (1987): Fruity sweet apple pineapple tutti frutti
Symrise: Strong, fruity-buttery, banana-like
Moellhausen: Sweet, fruity (banana and apple)