system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:Artificial food flavoring

How do scientists figure out how to get some chemicals to taste like something else, specifically a certain flavor? Example: Propel watermelon flavored water. Has no mention of anything watermelon-y, yet tastes like watermelon.
gpt
Well, "watermelon" can be re-described in terms of chemically-sounding names. Everything is made of chemicals, so you can think of it like two languages: everything has its common name (watermelon), and it's technical, chemically name.

Any naturally-ocurring chemical can and has been recreated in a lab. One day, a scientist decided, "I wonder what makes watermelon taste like watermelon". He got some watermelon and his analysis equipment and figured-out what chemicals are in watermelon. He identified which specific one is responsible for the taste, and "presto". Synthetic watermelon flavoring.