1,3,5-Trimethoxybenzene -d3 (Trimethyl phloroglucinol-d3) is the deuterium labeled 1,3,5-Trimethoxybenzene. 1,3,5-Trimethoxybenzene is a key component of the Chinese rose odor. 1,3,5-Trimethoxybenzene is synthesized in three successive methylation steps from phloroglucinol, the initial precursor.