Seofurane was a substance which was used in the construction of biological sample containers.

Seofurane fragments were found in Ibudan's quarters aboard a Bajoran transport during the investigation of his murder in 2369 near the matter reclamation unit, where Ibudan had apparently tried to dispose of them. (DS9: "A Man Alone")

The Star Trek Encyclopedia calls this biochemical substance "seofurance".
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