How to pronounce retinal purple in English?

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retinal purple::noun | Spocien Dictionary

retinal purple

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a red photopigment in the retinal rods of vertebrates; dissociates into retinene by light

Type	Words
Synonyms	rhodopsin, visual purple
Type of	photopigment

retinal purple

In April 2007 it was suggested that early archaea may have used retinal, a purple pigment, instead of chlorophyll, to extract energy from the sun.

From the en.wikipedia.org