Desmethoxycurcumin is a curcuminoid found in turmeric.[1] Commercial grade curcumin contains a mixture of curcuminoids (desmethoxycurcumin 10–20%, bisdesmethoxycurcumin 5% or less).[2]
^Sotanaphun, U.; Phattanawasin, P.; Sriphong, L. (2009). "Application of Scion image software to the simultaneous determination of curcuminoids in turmeric (Curcuma longa)". Phytochemical Analysis. 20 (1): 19–23. Bibcode:2009PChAn..20...19S. doi:10.1002/pca.1086. PMID18683171.