active ingredient

1. (especially)The specific compound in a natural or man-made mixture that is responsible for the mixture's activity.

   Wirkstoff, Arzneimittelwirkstoff

   действующее веществоdejstvujuščeje veščestvo

2. (figuratively)The essence of something, or a sine qua non that it requires.

1. What’s active ingredient of this shampoo?

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2. What is the active ingredient in aspirin?

   ruКакое действующее вещество в аспирине?

   deWelchen Wirkstoff hat Aspirin?

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3. What is the active ingredient in Tylenol?

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4. What is the active ingredient in Advil?

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