2-(3-Oxobutyl)-2-azaspiro[4.5]decan-3-one-d6 is the isotope labelled analog of 2-(3-Oxobutyl)-2-azaspiro[4.5]decan-3-one (O848400); a derivative of Gabapentin Lactam (G117275) which is a compound that reduces protein aggregates and improves motor performance in a transgenic mouse model of Huntington’s disease. Gabapentin Lactam also opens mitochondrial ATP-dependent potassium channels.