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Perfluoropropanesulfonic Acid-13C is labeled Perfluoropropanesulfonic Acid (P286580), which can be found in biological and environmental matrixes.

[1] KRISTA A. BARZEN-HANSON  Jennifer A F. Discovery and Implications of C2 and C3 Perfluoroalkyl Sulfonates in Aqueous Film-Forming Foams and Groundwater[J]. Environmental Science & Technology Letters Environ., 2015, 2 4: 95-99. DOI: 10.1021/acs.estlett.5b00049