Impurity Reference Standard - Products

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Cleanchem is a trusted provider of premium pharmaceutical reference materials, specializing in Zopiclone and its associated compounds. Our catalog includes pharmacopeial and non-pharmacopeial Zopiclone impurities, metabolites, nitrosamine derivatives (N-NO compounds), and stable isotope-labeled products. These reference standards play a critical role in pharmaceutical R&D, supporting activities such as product formulation, ANDA and DMF submissions, quality assurance, analytical method development, and stability assessments.
All Zopiclone-related substances undergo comprehensive characterization and are delivered with complete Certificates of Analysis and supporting analytical documentation to ensure regulatory adherence. Upon request, we can offer EP/USP traceable standards. Our products are routinely re-evaluated to maintain consistent quality and performance.

Zopiclone EP Impurity A

CAT No: CL-ZPC-01 CAS No: 43200-96-0 Mol Wt: 404.8 Mol F: C17H17ClN6O4 Inv Status: In Stock

Chemical Name: 1-Piperazine-carboxylic Acid 4-Methyl-4-oxide 6-(5-Chloro-pyridin-2-yl)-7-oxo-6,7-dihydro-5H-pyrrolo[3,4-b]pyrazin-5yl Ester

Zopiclone Impurity 1

CAT No: CL-ZPC-02 CAS No: 1072-98-6 Mol Wt: 128.6 Mol F: C5H5ClN2 Inv Status: In Stock

Chemical Name: 5-Chloropyridin-2-amine

N-Desmethyl Zopiclone

CAT No: CL-ZPC-03 CAS No: 59878-63-6 Mol Wt: 374.79 Mol F: C16H15ClN6O3 Inv Status: In Stock

Chemical Name: 6-(5-Chloropyridin-2-yl)-7-oxo-6,7-dihydro-5H-pyrrolo[3,4-b]pyrazin-5-yl piperazine-1-carboxylate

Eszopiclone (S-Zopiclone)

CAT No: CL-ZPC-04 CAS No: 138729-47-2 Mol Wt: 388.8 Mol F: C17H17ClN6O3 Inv Status: Custom Synthesis

Chemical Name: (S)-6-(5-Chloropyridin-2-yl)-7-oxo-6,7-dihydro-5H-pyrrolo[3,4-b]pyrazin-5-yl 4-methylpiperazine-1-carboxylate

N-Desmethyl Zopiclone HCl

CAT No: CL-ZPC-05 CAS No: 1216659-29-8 Mol Wt: 374.8 : 36.5 Mol F: C16H15ClN6O3 : HCl Inv Status: Custom Synthesis

Chemical Name: 6-(5-Chloropyridin-2-yl)-7-oxo-6,7-dihydro-5H-pyrrolo[3,4-b]pyrazin-5-yl piperazine-1-carboxylate hydrochloride

Zopiclone

CAT No: CL-ZPC-06 CAS No: 43200-80-2 Mol Wt: 388.8 Mol F: C17H17ClN6O3 Inv Status: Custom Synthesis

Chemical Name: (5RS)-6-(5-Chloropyridin-2-yl)-7-oxo-6,7-dihydro-5H-pyrrolo[3,4-b]pyrazin-5-yl 4-methylpiperazine-1-carboxylate (as per EP)

Zopiclone EP Impurity B

CAT No: CL-ZPC-07 CAS No: 43200-81-3 Mol Wt: 262.7 Mol F: C11H7ClN4O2 Inv Status: Custom Synthesis

Chemical Name: 6-(5-chloropyridin-2-yl)-7-hydroxy-6,7-dihydro-5H-pyrrolo[3,4-b]pyrazin-5-one

Zopiclone Deschloro Impurity

CAT No: CL-ZPC-08 CAS No: 1348046-61-6 Mol Wt: 354.4 Mol F: C17H18N6O3 Inv Status: Custom Synthesis

Chemical Name: 7-Oxo-6-(pyridin-2-yl)-6,7-dihydro-5H-pyrrolo[3,4-b]pyrazin-5-yl 4-methylpiperazine-1-carboxylate

Zopiclone Impurity 10

CAT No: CL-ZPC-09 CAS No: NA Mol Wt: 496.6 Mol F: C24H32N8O4 Inv Status: Custom Synthesis

Chemical Name: 6-(5-Methylpyridin-2-yl)-6,7-dihydro-5H-pyrrolo[3,4-b] pyrazine-5,7-diyl bis(4-methyl piperazine-1-carboxylate)

Zopiclone Impurity 11

CAT No: CL-ZPC-10 CAS No: NA Mol Wt: 663.4 Mol F: C28H20Cl2N10O6 Inv Status: Custom Synthesis

Chemical Name: Bis(6-(5-chloropyridin-2-yl)-7-oxo-6,7-dihydro-5H-pyrrolo[3,4-b]pyrazin-5-yl) piperazine-1,4-dicarboxylate

Zopiclone Impurity 14

CAT No: CL-ZPC-11 CAS No: 1279710-67-6 Mol Wt: 344.8 Mol F: C16H17ClN6O Inv Status: Custom Synthesis

Chemical Name: 6-(5-Chloropyridin-2-yl)-7-(4-methylpiperazin-1-yl)-6,7-dihydro-5H-pyrrolo[3,4-b]pyrazin-5-one

Zopiclone Impurity 15

CAT No: CL-ZPC-12 CAS No: 2829521-02-8 Mol Wt: 390.8 Mol F: C17H19ClN6O3 Inv Status: Custom Synthesis

Chemical Name: (3-((5-Chloropyridin-2-yl)carbamoyl)pyrazin-2-yl)methyl 4-methylpiperazine-1-carboxylate

Zopiclone Impurity 2

CAT No: CL-ZPC-13 CAS No: NA Mol Wt: 152.1 : 2(60.1) Mol F: C6H4N2O3 : 2(C2H4O2) Inv Status: Custom Synthesis

Chemical Name: 7-Hydroxyfuro[3,4-b]pyrazin-5(7H)-one diacetate

Zopiclone Impurity 3

CAT No: CL-ZPC-14 CAS No: NA Mol Wt: 152.1 : 2(60.1) Mol F: C6H4N2O3 : 2(C2H4O2) Inv Status: Custom Synthesis

Chemical Name: 3-Formylpyrazine-2-carboxylic acid diacetate

Zopiclone Impurity 5

CAT No: CL-ZPC-15 CAS No: 1122549-43-2 Mol Wt: 264.7 Mol F: C11H9ClN4O2 Inv Status: Custom Synthesis

Chemical Name: N-(5-Chloropyridin-2-yl)-3-(hydroxymethyl)pyrazine-2-carboxamide

Zopiclone Impurity 6

CAT No: CL-ZPC-16 CAS No: NA Mol Wt: 264.7 Mol F: C11H9ClN4O2 Inv Status: Custom Synthesis

Chemical Name: 6-(5-Chloropyridin-2-yl)-6,7-dihydro-5H-pyrrolo[3,4-b]pyrazine-5,7-diol

Zopiclone Impurity 8

CAT No: CL-ZPC-17 CAS No: NA Mol Wt: 423.3 Mol F: C17H16Cl2N6O3 Inv Status: Custom Synthesis

Chemical Name: 6-(3,5-Dichloropyridin-2-yl)-7-oxo-6,7-dihydro-5H-pyrrolo[3,4-b]pyrazin-5-yl 4-methylpiperazine-1-carboxylate

Zopiclone Impurity 16

CAT No: CL-ZPC-18 CAS No: 2334434-49-8 Mol Wt: 598.0 : 36.5 Mol F: C27H29ClFN9O4 : HCl Inv Status: Custom Synthesis

Chemical Name: (S)-1-(5-(4-(4-((3-Chloropyridin-2-yl)((R)-piperidin-3-yl)carbamoyl)-2-fluorophenyl)-1-methyl-1H-pyrazol-5-yl)-1H-tetrazol-1-yl)ethyl ethyl carbonate hydrochloride

Type:Impurity Reference Standard

Total Products: 18

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