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Flavonoids
Also known as vitamin P and citrin - They are a result of metabolic processes in certain plants.
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Methylxanthines
Mild stimulant
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Biogenic amines
Like adrenaline, histamine or serotonin
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Cannabinoids
Like the ones found in cannabis
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All these compounds are organic molecules that play various roles in the biochemical processes in our bodies and in plants.
It won't help you much to understand the intricate details of chemical definitions.
What does truly matter is to understand that when you physically crave for a certain food, what you crave for is usually not the food itself but one or many of the compounds that you find in that specific food.
So, if a given type of food is bad for you ( like chocolate) and you want to stop eating it, you need to find ways of getting the same ingredients in other ways.
Here is a simple example:
When you physically crave for cheese, you might in fact crave for fat+protein.
So, if you give your body fat and protein in other forms, you body will stop sending the craving signals out.
This nutrition strategy IS the long term solution to tackle negative cravings and works much better than any suppression tactic!