“Optimized Synthesis and Simple Purification of 2,5-Diamino-Thiophene-3,4-dicarboxylic Acid Diethyl Ester”

Bourgeaux, M., Vomscheid, S., and Skene, W. G. “Optimized Synthesis and Simple Purification of 2,5-Diamino-Thiophene-3,4-dicarboxylic Acid Diethyl Ester” Synth. Commun., 37, 20, 3551-3558 (2007).