4,5,5a,6,7,8a-hexahydro-5a-hydroxy-6,8a-dimethyl-7-oxo-8H-thiazolo[4,5e-indole]

ethyl 2-(1-methyl-2,6-dioxocyclohexyl)acetate

ethyl 2-amino-4,5,6,7-tetrahydro-4-methyl-5-oxo-4-benzothiazoloacetate

ethyl 2-chloro-4,5,6,7-tetrahydro-4-methyl-5-oxo-4-benzothiazoleacetate

2-(2-chloro-4-methyl-5-oxo-4,5,6,7-tetrahydrobenzo[d]thiazol-4-yl)acetic acid