Synthetics
3-methyl-1-pentanol has no reported odor.
Mosciano, Gerard P&F 15, No. 6, 35, (1990): Pungent, fusel, cognac and wine, cocoa, with green fruity undernotes
Luebke, William tgsc, (1989): Fusel cognac wine cocoa green fruity
Bedoukian Research: Earthy, green
For an earthy note in fragrances.