CAS 40203-73-4 appears in our catalog under these names: Cyclopentylideneacetic acid methyl ester, 96%, Methyl 2-cyclopentylideneacetate, 96%, Methyl 2-cyclopentylideneacetate, Methyl 2-cyclopentylideneacetate, 96%(GC-MS),RG, 96%(GC-MS),RG. Offered by: Combi-blocks, AmBeed, Biosynth, Chemat. Available pack sizes: 1g, 250mg, 0,25g, 25mg, 100mg, 5g, 25g.