The answer is: Kaopectane.
Kaopectate is a medication for the treatment of mild diarrhea.
First, kaolinite was used as the adsorbent in this medication. Kaolinite is aa layered silicate mineral, with the chemical composition Al₂Si₂O₅(OH)₄.
Now, bismuth subsalicylate is used as the active absorbent in Kaopectate.
Bismuth subsalicylate has the empirical chemical formula of C₇H₅BiO₄.