<unk>  is a phenylpropene, a propenyl-substituted guaiacol. A phenylpropanoid, it occurs in the essential oils of plants such as ylang-ylang (Cananga odorata). It can be synthesized from eugenol and had been used in the manufacture of vanillin. It may occur as either the cis (Z) or trans (E) isomer. Trans (E)<unk>  is crystalline while cis (Z)<unk>  is a liquid.[citation needed]
Isoeugenol
Coal tar
Methylene diphenyl diisocyanate
Toluene
Dimethylphthalate
Nitrazine
Toluene diisocyanate
Cyclohexane