5-aminomethyl-3-benzyloxy-isoxazole-4-carboxylic acid methyl ester

3-benzyloxy-5-carboxymethyl-isoxazole-4-carboxylic acid methyl ester

3-benzyloxy-5-(1-ethoxy-ethoxycarbonylmethyl)-isoxazole-4-carboxylic acid methyl ester

3-benzyloxy-5-((4aΞ,9aS)-5-benzyloxy-9t-hydroxy-9c-methyl-4,10-dioxo-(9ar)-1,2,3,4,4a,9,9a,10-octahydro-anthracen-2c-ylmethyl)-isoxazole-4-carboxylic acid methyl ester