Where does “chelate” come from?

I need to work through this carefully, but I notice there's a problem with the chain provided. The chain shows: English chela → Latin chele → Ancient Greek χηλή → Proto-Italic -ātos → Proto-Indo-European -tós → Proto-Indo-European -tós This chain doesn't make sense. It goes from χηλή (meaning "claw") backwards through suffixes (-ātos, -tós, -tós), and the connection between the noun "chela/χηλή" and these suffixes isn't explained. Additionally, "chelate" (the English headword requested) is not the same as "chela" - chelate is an adjective/verb derived from chela. The chain appears corrupted or incomplete. Without a coherent etymological chain that actually traces chelate back through its ancestors with clear sense development, I cannot write an accurate one-sentence origin

chelate (English): having chelae, or in the form of a chela;...