Declension of the word "wirkstoff"
Singular and plural for Wirkstoff,
m, strong declension 
active substance, agent, active ingredient
Popular German Verbs
sich sagen
stehlen
gefährden
verlangen
umgeben
zinsen
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enthalten
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ziehen
sich beschäftigen
sich beschließen
sich ersetzen
sich unterschreiben
erscheinen
lassen
sich mögen
begegnen
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