Question

What functional groups are found in the structure of melatonin?

Answer 1

Indole, ether, amide.

Explanation:

https://en.wikipedia.org/wiki/Melatonin

The functional groups in melatonin are the methyl ether group `"CH"_3"O"` on the phenyl ring, the indole group itself, and the acetamide group `"CH"_3"CONH"`.