7-Boc-5,6-dihydro-8H-imidazo[1,2-a]pyrazine-2-carboxylic acid

7-Boc-5,6,7,8-tetrahydroimidazo[1,2-a]pyrazine-2-carboxylic Acid

7-[(tert-butoxy)carbonyl]-5H,6H,7H,8H-iMidazo[1,2-a]pyrazine-2-carboxylic acid

5,6-Dihydro-8H-imidazo[1,2-a]pyrazine-2,7-dicarboxylic acid 7-tert-butyl ester

7-(tert-butoxycarbonyl)-5,6,7,8-tetrahydroimidazo[1,2-a]pyrazine-2-carboxylic acid