7,7'-(Butane-1,4-diylbis(oxy))bis(3,4-dihydroquinolin-2(1H)-one)-d8

7,7'-(Butane-1,4-diylbis(oxy))bis(3,4-dihydroquinolin-2(1H)-one)-d8 is the deuterium labeled 7,7'-(Butane-1,4-diylbis(oxy))bis(3,4-dihydroquinolin-2(1H)-one).