(2R,3R,4S)-3-Acetylamino-4-[2,3-bis(tert-butoxycarbonyl)-guanidino]-3,4-dihydro-2H-pyran-2,6-dicarboxylic acid 6-benzhydryl ester

benzhydryl (2R,3R,4S)-3-acetamido-4-(2,3-bis(tert-butoxycarbonyl)guanidino)-2-(nonyl(propyl)carbamoyl)-3,4-dihydro-2H-pyran-6-carboxylate

benzhydryl (2R,3R,4S)-3-acetamido-4-(2,3-bis(tert-butoxycarbonyl)guanidino)-2-(diethylcarbamoyl)-3,4-dihydro-2H-pyran-6-carboxylate

(4S,5R,6R)-5-Acetylamino-4-[2,3-bis(tert-butoxycarbonyl)guanidino]-6-dipropylcarbamoyl-5,6-dihydro-4H-pyran-2-carboxylic acid benzhydryl ester