C9H13NO3

The molecular formula C9H13NO3 may refer to: Epinephrine ·
Epinephrine, also known as adrenalin or adrenaline, is a hormone, neurotransmitter and medication. Epinephrine is normally produced by both the adrenal glands and certain neurons.

Dopamine: increased energy, less need for sleep or food, focused attention and exquisite delight in smallest details of this novel relationship”.   

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Chemistry of love
The receptors are located in the same place as the reaction of euphoria when taking a drug. This causes people to become addicted to love.