Assertion: antacid's calcium carbonate | /r/HasProperty | known gastric antacids
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Source sentences:
text: Calcium carbonate, magnesium carbonate and magnesium trisilicate are known gastric antacids (for example, see Remington's Pharmaceutical Sciences, 18th Edtn., 1990, published by Mack Publishing Co., Chapter 39 on "Gastrointestinal Drugs) with relatively fast onset of action and prolonged duration of action.