Pemetrexed disodium INT-4

for the following products 4-(2-(2-Amino-4-oxo-4,7-dihydro-3H-pyrrolo(2,3-d)pyrimidin-5-yl)ethyl)benzoic acid | 4-(2-{2-Amino-4-oxo-3H,4H,7H-pyrrolo[2,3-d]pyrimidin-5-yl}ethyl)benzoic acid | 4-[2-(2-Amino-4,7-dihydro-4-oxo-1H-pyrrolo[2,3-d]pyrimidin-5-yl)ethyl]benzoic acid | Pemetrexed disodium hydrate intermediate and Pemetrexed disodium INT-4