6-methylcoumarin is a member of the class of coumarins that is coumarin in which the hydrogen at position 6 is replaced by a methyl group. It has a role as a fragrance and an allergen. 6-Methylcoumarin, widely used in cosmetics, is capable of inducing contact photoallergy in human volunteers.It has hepatotoxicity.

Trigonelline chloride, an alkaloid with potential antidiabetic activity, is present in considerable amounts in coffee. Trigonelline hydrochloride reduces diabetic auditory neuropathy by affecting β cell regeneration.

2-Hydroxy-4-methoxybenzaldehyde is a member of phenols and a member of methoxybenzenes.

Rhodamine B is an organic chloride salt having N-[9-(2-carboxyphenyl)-6-(diethylamino)-3H-xanthen-3-ylidene]-N-ethylethanaminium as the counterion. An amphoteric dye commonly used as a fluorochrome. It has a role as a fluorescent probe, a fluorochrome and a histological dye. It is an organic chloride salt and a xanthene dye. It contains a rhodamine B(1+). Rhodamine B is used as a tracer dye in water to determine the rate and direction of flow and transport. It is a staining fluorescent dye used in fluorescence microscopy, flow cytometry, fluorescence correlation spectroscopy and ELISA in biotechnology fields.