Synthetics
Meta-dimethyl hydroquinone smells like a distinctly mushroomy, fungal odor.
Mosciano, Gerard P&F 17, No. 3, 57, (1992): Sweet, cooling, medicinal, root beer-like
Luebke, William tgsc, (1998): Acid fruity nutmeg neroli
Moellhausen: Nutty, roasted note, phenolic, stuffy
Lluch Essence: Phenolic, rancid, roasted
Sigma-Aldrich: Coconut; hazelnut; earthy.