98457-88-6 Aminopterin N-hydroxysuccinimide ester L-Glutamic acid, N-(4-((2,4-diamino-6-pteridinyl)methylamino)benzoyl)-, mono(2,5-pyrrolidinedione) deriv. N-(4-((2,4-Diamino-6-pteridinyl)methylamino)benzoyl)-L-glutamic acid mono(2,5-pyrrolidinedione) deriv. N-Hydroxysuccinimide aminopterin Nhs-aminopterin