Pungent compound (NH3) (7)

I believe the answer is:

ammonia

(Other definitions for ammonia that I've seen before include "Gas compounded of nitrogen and hydrogen, NH3" , "Smelling salts (NH3)" , "Colourless pungent gas" , "Gas released by smelling salts" , "Acrid gas, NH3" .)

I've seen this clue in The Guardian.

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