| 4-carboxy-5-(2-chloroacetamido)-3-methyl-2-thiopheneacetic aci diethyl este |
| 2-chloroacetylamino-3-ethoxycarbonyl-4-methyl-5-thiopheneacetic acid ethyl es |
| 5-((chloroacetyl)amino)-4-(ethoxycarbonyl)-3-methyl-2-thiopheneacetic aci |
| 4-carboxy-5-(2-chloroacetamido)-3-methyl-2-thiopheneacetic acid diethyl ester |
| 4-carboxy-5-(2-chloroacetamido)-3-methyl-2-thiopheneacetic aci diethyl ester |
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