硫酸

cyclohepta-2,4-dien-1,1,2,3,4,5,6,7-octacarboxylic acid-1,1-diethyl ester-2,3,4,5,6,7-hexamethyl ester

苯肼

diethyl 2-(5-oxooxolan-2-ylidene)propanedioate

3,4-二氨基甲苯