Synthetics
2-methyl-2-pentenoic acid has a strong, fruity aroma with subtle fatty and herbal notes.
Mosciano, Gerard P&F 23, No. 1, 33, (1998): Sour, acidic, sweaty and fruity with a jammy, woody nuance
Luebke, William tgsc, (1995): Dry acid sweaty strawberry woody fruity jam
FCI SAS: Fruity odor with a burnt sugar background