Curcumin is the most abundant curcuminoid in turmeric, providing about 75 % of the total curcuminoids, while demethoxycurcumin and bisdemethoxycurcumin generally represent 10 % -20 % and less than 5 % of the total curcuminoids, respectively (108). (lpi.oregonstate.edu)
Besides curcumin, other analogues such as bisdemethoxycurcumin (BDMC) and cyclocurcumin are also available in turmeric. (webspace.pugetsound.edu)
Diferuloylmethane (or curcumin, the primary curcuminoid responsible for turmeric's vibrant yellowish color), demethoxycurcumin, and bisdemethoxycurcumin. (mefirstliving.com)