叔-丁基3-氧代-1-氧杂-6-氮杂螺[3.3]庚烷-6-羧酸酯

2-[(2-methylpropan-2-yl)oxycarbonyl]-5,5-dioxo-5λ⁶-thia-2-azaspiro[3.4]octane-8-carboxylic acid

8-Methyl 2-(2-methyl-2-propanyl) 5-thia-2-azaspiro[3.4]octane-2,8 -dicarboxylate 5,5-dioxide

3-(3-氟苯基)-3-羟基氮杂丁烷-1-羧酸叔丁酯

叔-丁基3-羟基-1-氧杂-6-氮杂螺[3.3]庚烷-6-羧酸酯