4-Amino-2-methylthiophen-3-carbonsaeuremethylester-hydrochlorid
4-Hydroximino-2-methyl-4-oxo-tetrahydrothiophen-3-carbonsaeuremethylester
3-(Methoxycarbonylmethylthio)-buttersaeuremethylester
2-Methyl-4-oxo-tetrahydrothiophen-3-carbonsaeuremethylester
4-Benzoxycarbonylamino-2-methylthiophen-3-carbonsaeuremethylester