naphtho[2,3-d]oxazol-2-ylmethyl ((benzyloxy)carbonyl)-L-alaninate

(8-methyl-6-oxo-6H-chromeno[6,7-d]oxazol-2-yl)methyl ((benzyloxy)carbonyl)-L-alaninate

(2-methyl-6-oxo-6H-chromeno[6,7-d]oxazol-8-yl)methyl ((benzyloxy)carbonyl)-L-alaninate