CAS 1142198-19-3 appears in our catalog under these names: Ethyl 1-(aminocarbonyl)cyclobutanecarboxylate, 95%, Apalutamide Impurity 33, Ethyl 1-carbamoylcyclobutanecarboxylate, 95%, 95%, Apalutamide Impurity 19. Offered by: Combi-blocks, Chemat Brand, Chemat. Available pack sizes: 250mg, 1g, on request, 100mg.