Synthetics
Isobutyl 2-butenoate has a sweet, fruity, and slightly floral aroma.
Mosciano, Gerard P&F 20, No. 6, 49, (1995): Woody, fruity, brown, ripe and alcoholic-like with cognac and rum nuances
Luebke, William tgsc, (1996): Fruity dry tropical rummy ripe green pear (caramellic is the long drydown)
Bedoukian Research: A fruity, rum-like character
Can enhance berry qualities of fragrances.