Structure of the nature's sleep inducing hormone,Melatonin is shown below.What carboxylic acid derivative/s is/are featured in this molecule? 
Definitions:
Baby Formula
A manufactured food designed and marketed for feeding to babies and infants, usually prepared for bottle-feeding or cup-feeding from powder or liquid.
Price Decrease
a reduction in the cost of goods or services, often triggered by factors such as increased supply, reduced demand, or competitive pricing strategies.
Income Effect
The change in an individual's or economy's income and how that change will impact the quantity demanded of a good or service.
Inferior Good
A good, such as used clothes, for which demand decreases, or shifts leftward, as consumer income rises.
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