2-Nonanone (Heptyl methyl ketone) is an endogenous metabolite, an antagonist of CYP1A2 (Potency = 35.6 μM), and is used as a flavor in the food industry.
2-(3-Hydroxy-2-oxoindolin-3-yl)-acetic acid is a naturally occurring organic acid containing an indole ring that is used in organic synthesis and biochemical research.
5-O-Methylnaringenin is a marker, reduced MS detection of 5-O-methylnaringenin indicated that nifedipine may preferably remove a proton from the 5-position OH group in the A ring of the flavonoid skeleton.