Two chemists prepared a complex and determined its formula, which they wrote as [CrCl₃NH₃] · 2H₂O. However, when they dissolved 2.11 g of the compound in water and added an excess of silver nitrate, 2.87 g of AgCl precipitated and they realized that the formula was incorrect. Write the correct formula of the compound and draw its structure, including all possible isomers.