for the following products
2-Chloro-N-(2-oxo-tetrahydro-thiophen-3-yl)acetamide | 2-Chloro-N-(tetrahydro-2-oxo-3-thienyl)acetamide | 3-(Chloroacetamido)dihydro-2(3H)-thiophenone | N-(2-Oxo-3-thienyl)-2-chloroacetamide and N-Chloroacetyl-DL-homocysteine thiolactone
