Pemetrexed Mixture of Impurity B & C

Chemical Name: (2S,2'S)-2,2'-((4,4'-((2,2'-Diamino-4,4',6-trioxo-1,4,4',6,7,7'-hexahydro-1'H,5H-[5,6'-bipyrrolo[2,3-d]pyrimidine]-5,5'-diyl)bis(ethane-2,1-diyl))bis(benzoyl))bis(azanediyl))diglutaric acid