pH Indicators and Xenobiology

In that question, I listed bromothymol blue as a type of indicator that could serve this purpose. I was then politely informed that bromothymol blue is not an organic pigment, and that it can't be created in nature

My main question is as follows: is there any kind of biology (e.g. Not carbon based) that would make this pigment useful as a biological pigment?

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pH Indicators and Xenobiology

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