4-Ethyl-1,4,7,8-tetrahydro-3H,10H-spiro-3,10-dione-d5
4-Ethyl-1,4,7,8-tetrahydro-3H,10H-spiro[pyrano[3,4-f]indolizine-6,2'-[1,3]dioxolane]-3,10-dione-d5 is the deuterium labeled 4-Ethyl-1,4,7,8-tetrahydro-3H,10H-spiro[pyrano[3,4-f]indolizine-6,2'-[1,3]dioxolane]-3,10-dione.