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Populated by {{ Chem molar mass/format}} ( talk). That template can take a value in any of several different parameters; this category tracks when more than one is passed. It is called via {{ Chem molar mass}} ( talk) from {{ Infobox drug}} ( talk). In that context, it tracks pages that have a molecular formula specified by individual element parameters (|C=...|H=......), which triggers the template to auto-calculate the molecular weight, when there is also an explicit |molecular_weight= value.