Synthetics
Butyl isovalerate smells like a fruity, slightly goat-like scent.
Mosciano, Gerard P&F 24, No. 2, 49, (1999): Fruity, sweet, pineapple, pungent, green, apple and peach nuances
Luebke, William tgsc, (1988): Apple pear fruit sweet pineapple green peach
Indukern F&F: Fruity, sweet, apple