While not the longest chemical name in English, the name for tryptophan synthease (a protein enzyme) has 1909 letters. This is considered the longest "published" English word, but is dwarfed by the 189,819-letter name for the largest known protein, titin.
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1909
The letters spell the word presidents. The word uses all ten letters.
The letters spell the word python. The word uses all six letters.
The letters spell the word leech.
The letters spell the word observed. It uses all of the letters serdobve.