3,​5-​Bis[[3-​bromo-​4-​(methoxymethoxy)​phenyl]​methylene]​-​1-​(phenylmethyl)​-4-​piperidinone is an intermediate in synthesizing CARM1-IN-1 Hydrochloride (C183610), a mixed Histone/Protein Methyltransferase, Acetyltransferase, and Class III Deacetylase (Sirtuin) inhibitor.