In the second case, you've found an archaic or jargon term for the molecule. This happens from time to time. If you really want to get to the bottom of occurrences like this, identify the reference you're using. Googleing for your first molecule gives N-Methyl-p-aminophenol sulfate, sometimes called Metol. You second formula gives an unrelated compound, that doesn't have the common name Metol.