... -oxo-3H-pyrrolo[2,3-d]pyrimidin-5-yl)ethyl]benzoyl]L-glutamic acid,1.5-diethyl ester,4-methylbenzenesulfonate(1:1 ... introduction ]Intermediate of pemetrexed [ Structural formula ]..........................................[C A S ]165049-28-5[ Chemical name ]N-[4-[2-(2-amino-4,7-dihydro ... -oxo-3H-pyrrolo[2,3-d]pyrimidin-5-yl)ethyl]benzoyl]L-glutamic acid,1.5-diethyl ester,4-methylbenzenesulfonate(1:1 ...