1-Methyladenosine-d3 hydrochloride is the deuterium-labeled hydrochloride salt form of 1-Methyladenosine. This compound is known as an RNA modification and serves as a tumor marker, as elevated levels in the body are associated with cancer development. Post-methylation, 1-Methyladenosine can drive liver tumor formation by upregulating PPARδ expression, regulating cholesterol metabolism, and activating the Hedgehog signaling pathway.