tert-Butyl N-(4-Amino-1-methylcyclohexyl)carbamate-d3 is the isotope labelled analog of tert-Butyl N-(4-Amino-1-methylcyclohexyl)carbamate (B693140); a reagent in the synthesis of diamino heterocycle-carboxamide compounds which can serve as EML4-ALK fusion protein kinase inhibitors.