Select the right MolarMass result for a chemical compound?

Questions
,
1

When I try to obtain the MolarMass of aniline I obtain 4 different results.

manilina = ChemicalData["aniline", "MolarMass"]

{Quantity[93.1265, ("Grams")/("Moles")], 
 Quantity[94.1191, ("Grams")/("Moles")], 
 Quantity[94.1199, ("Grams")/("Moles")], 
 Quantity[99.0824, ("Grams")/("Moles")]}

How to select the correct value for further calculations

2

Try selecting the one you want;

   ChemicalData["aniline"]
   EntityValue[%, "StandardName"]

    {"Cyanol", "Aniline13C1", "Aniline15N1", "Aniline13C6"}