Synthetics
Ethyl 2-hexenoate has a fruity, slightly green, and slightly sweet aroma that is often used as a food additive.
Luebke, William tgsc, (1989): Rum fruity green sweet juicy
Bedoukian Research: A pleasant, rum-like odor; fruity, green and sweet with a juicy undertone
For tropical nuances, grape, berry and apple applications.