3-[(tert-butoxy)-carbonylamino]-thiophene-2-carboxylic acid
methyl 5-bromo-3-((tert-butoxycarbonyl)amino)thiophene-2-carboxylate
3-amino-5-(4-methanesulfonyl-phenyl)-thiophene-2-carboxylic acid methyl ester
methyl 3-[(tert-butoxycarbonyl)amino]-5-formylthiophene-2-carboxylate