https://www.quirkyscience.com/thimerosal-in-vaccines/
"Its structure is seen in the image associated with this article. The S atom is SULFUR, the Hg is hydrargyrum (mercury). The ring is a benzene ring, and the line segment to the right of the mercury atom is an ethyl group. The piece directly above the ring that extends to the right is the anionic carboxylate group with its attached sodium cation."
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