5-Hydroxyindole, a hydroxylated indole, can be found in a vast array of pharmacologically active agents and natural products. 5-Hydroxyindole slows desensitization of the 5-HT3 receptor-mediated ion current in N1E-115 neuroblastoma cells.

4-Methyl-5,6,7,8-tetrahydroquinoline, a tetrahydroquinoline alkaloid, is isolated from the roots of Glycyrrhiza uralensis Fisch.

4-Methyl-1-pentanol (Isohexanol) is a volatile aroma compound of red wine from cv. Kalecik Karasι.

4-Hydroxy-4-methylcyclohexanone is a useful synthetic reagent extracted from patent JP2009022162A. 4-Hydroxy-4-methylcyclohexanone can be used to synthesize trans-4-amino-1-methylcyclohexanol which is intermediate of pharmaceutical synthesis.

4-Ethylresorcinol, a derivative of resorcinol, can act as substrates of tyrosinase. 4-Ethylresorcinol possess hypopigmentary effects. 4-Ethylresorcinol attenuates mRNA and protein expression of tyrosinase-related protein (TRP)-2, and possessed antioxidative effect by inhibiting lipid peroxidation.

4-Aminobenzaldehyde (p-aminobenzaldehyde) is a useful synthetic reagent and monomer that can be used to synthesize monoazo dyes and photocurable ion exchange resins. 4-Aminobenzaldehyde is also a corrosion inhibitor of metals.

4-Allyltoluene, an aromatic compound, can elicite antennal olfactory response of Mediterranean fruit fly measured by electroantennography (EAG).

3-Methylcatechol is a building block in the chemical synthesis produced by Pseudomonas putida MC2.

3-Methylcarbazole is an carbazole alkaloid compound with anticancer effects. 3-Methylcarbazole shows growth inhibitory activity (IC50 of 25 μg/mL) on human fibrosarcoma HT-1080 cells.

3-Furanmethanol belongs to the compound class of furan with a wide range of sensory properties. 2-cyanonaphthalenes undergo photocycloaddition reactions with 3-Furanmethanol efficiently and with high degrees of regioselectivity.

3-Furaldehyde is a member of furans and an aldehyde, and can be used to synthesize the neoclerodane diterpene Salvinorin A.

3-Butenoic acid (Vinylacetic acid) can be used to synthesize bicyclic 3,6-dihydro-1,2-oxazine. Strained bicyclic 3,6-dihydro-1,2-oxazine is a reactive substrate in domino metathesis with an external alkene.

3′,5′-Dimethoxyacetophenone is a natural ketone compound with antioxidant activities. 3′,5′-Dimethoxyacetophenone is a building block in the chemical synthesis.

3,11,15,23-Tetraoxo-27ξ-lanosta-8,16-dien-26-oic acid, a lanostane-type triterpenoid, is isolated from Antrodia camphorate.

2-Sec-butyl-3-methoxypyrazine (SBMP) is a methoxypyrazine and can be identified in the ladybug species.

2-Propylheptanol is an intermediate and can be used for synthesizing a series of plasticizers by esterification with phthalic anhydride, trimellitic anhydride and adipic acid, etc.

4-Methylthiophene is an intermediate used in the synthesis of the aromatic sulfur compounds.

2-Isobutyl-3-methoxypyrazine is an aroma constituent in grapes andwines, green pepper and asparagus.

2-Hydroxymethyltetrahydropyran is a volatile compound in Sambucus williamsii (SW) seed oil. SW seed oil has potential antioxidant activity.

2-Hydroxymethyl-5-hydroxypyridine is isolated from the the matured, ripened and dried seeds of S. lychnophora.

2-Heptanol is one of chemical constituents identified in the essential oil of rhizome of Curcuma angustifolia and Curcuma zedoaria. Rhizome essential oil exhibited good antimicrobial and antioxidant activity.

2-Amino-4-methoxyphenol is a volatile constituent in the aroma concentrate of Tieguanyin teas. 2-Amino-4-methoxyphenol is used for the synthesis of pyridine analogues.

2-Acetylpyrrole is a product of model browning systems, and has been isolated as a major flavour component of many foods. 2-Acetylpyrrole has been used in the synthesis of 2-acetyl-1-pyrroline.

2′-O-(2-Methoxyethyl)guanosine (2'-O-MOE-rG), a 2′-O-methoxyethyl-modified nucleoside, can be produced by enzymatic conversion (adenosine deaminase) from 2′-O-(2-methoxyethyl)-2,6-diaminopurine riboside. 2′-O-(2-Methoxyethyl)guanosine neither effectively phosphorylated by cytosolic nucleoside kinases, nor are they incorporated into cellular DNA or RNA.

2,6-Dimethylpyrazine is a key aroma compound in Boletus edulis.

2,6,6-Trimethylbicyclo[3.1.1]heptan-3-ol is isolated from Chrysanthemum indicum L..

2,5-Furandimethanol is obtained from 5-Hydroxymethylfurfural. 5-hydroxymethylfurfural, as a building block, is considered an important intermediate due to its rich chemistry and potential availability from carbohydrates such as fructose, glucose, sucrose, cellulose and inulin.

2,5-Dimethoxybenzoic acid is an intermediate used in the synthesis of the galbulimima alkaloid GB 13.

2,3-Pentanedione is a common constituent of synthetic flavorings and is used to impart a butter, strawberry, caramel, fruit, rum, or cheese flavor in beverages, ice cream, candy, baked goods, gelatins, and puddings. 2,3-Pentanedione also occurs naturally as a fermentation product in beer, wine, and yogurt and is releasedduring roasting of coffee beans.

2,3-Dimethyl-2,3-diphenylbutane is one of the decomposition of Dicumylperoxide (DCP). Diallyl orthophthalate (DAOP) is a reactive plasticizer initiated by 2,3-dimethyl-2,3-diphenylbutane for improving polyphenylene oxide (PPO) processing.