There are _____ carbons in the longest continuous chain of carbons in the molecule below. 
Definitions:
Pr
An abbreviated term that could stand for various things, without additional context, its specific meaning is unclear. NO.
Phytochrome
A photoreceptor protein in plants that regulates growth, development, and flowering in response to light.
Photoperiodism
The physiological response (such as flowering) of plants to variations in the length of daylight and darkness.
Phytochrome
A light-detecting pigment found in plants that regulates various developmental processes by responding to red and far-red light.
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