How many letters does the top answer for “a substance employed as a hypnotic, produced by the union of mercaptan and acetone.” have?

The most common answer is sulphonal (9 letters).

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Crossword clue: a substance employed as a hypnotic, produced by the union of mercaptan and acetone.

1 answer found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

sulphonal 9 letters web-def

A substance employed as a hypnotic, produced by the union of mercaptan and acetone.

Pattern

Data: SCOWL, igerman98, RLA-ES, Grammalecte, br.ispell · frequency: OpenSubtitles (see Data & licenses)