83953-11-1 F-MTX Fluoresceinated methotrexate L-Lysine, N2-(4-(((2,4-diamino-6-pteridinyl)methyl)methylamino)benzoyl)-N6-(((3',6'-dihydroxy-3-oxospiro(isobenzofuran-1(3H),9'-(9H)xanthen)-5-yl)amino)thioxomethyl)- N(alpha)-(4-Amino-4-deoxy-N(10)-methylpteroyl-N(epsilon)-4'-fluoresceinthiocarbamoyl)-L-lysine trihydrate PT 430 PT-430