对碘苯胺

N(2)-acetylpteroic acid

N(2)-acetyl-N(10)-trifluoroacetylpteroic acid

4-(N-((2-acetamido-4-oxo-3,4-dihydropteridin-6-yl)methyl)-2,2,2-trifluoroacetamido)benzoic (isobutyl carbonic) anhydride

乙酸酐