| http://www.w3.org/ns/prov#value | - l2 (OH)16 CO3, 4H2 O), MgO.Al2 O3.2SiO2.nH2 O, wherein n not is an integer and less than 2 or similar compounds; or other pharmaceutically acceptable pH-buffering substances such as, for instance the sodium, potassium, calcium, magnesium and aluminium salts of phosphoric, citric or other suitable, weak, inorganic or organic acids.
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