| 4-carboxy-3-methyl-5-(2-phenylacetamido)-2-thiopheneacetic aci |
| 2-phenylacetylamino-3-carboxy-4-methyl-5-thiopheneacetic acid |
| 4-carboxy-3-methyl-5-((phenylacetyl)amino)-2-thiopheneacetic aci |
| 4-carboxy-3-methyl-2-(2-phenylacetamido)-2-thiopheneacetic acid |
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