title: Field desorption mass spectra of methotrexate and folic acid analogs.
abstract: Field desorption mass spectra of methotrexate and folic acid analogs yield abundant molecular or quasimolecular ions. At emitter currents above the best anode temperature, fragment ions which are useful as further confirmations of structures are observed.
mesh_terms: D005492:Folic Acid / Q000031:analogs & derivatives* / Q000032:analysis; D013058:Mass Spectrometry; D008727:Methotrexate / Q000031:analogs & derivatives* / Q000032:analysis
chemical_list: D005492:Folic Acid; D008727:Methotrexate