| Ethyl 2-(2-aminothiazole-4-yl)-2-(1-tert-butoxycarbonyl-1-methylethoxyimino)acetate |
| 2-(2-aminothiazole-4-yl)-2-[2-(tertbutoxycarbonyl)isopropoxyimino] Acetic acid |
| 2-(2-aminothiazole-4-yl)-2-[2-(tertbutoxy carbonyl)isopropoxy imino]acetic acid |
| ethyl 2-(2-aminothiazol-4-yl)-2-(1-tert- butoxycarbonyl-1-methyl)ethoxyiminoacetate |