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A	B	C	D	E	F
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5-Hydroxyflunixin-d3

4-Aminoantipyrine-d3 (aa-d3)

4-Acetamido-d3-anti-pyrine

Isopropylaminoanti-pyrine-d6 (ipaa-d6;ramifenazon-d6)

Tolfenamic acid-13c6

Mefenamic acid-13c6

Flufenamic acid-13c6

Niflumic acid-13c6

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