Medchemexpress, HY-111645 10mg 3-Methylcytidine CAS:2140-64-9 3-Methylcytidine, a urinary nucleoside, can be used as a biomarker of four different types of cancer: lung cancer, gastric cancer, colon cancer, and breast cancer [1] . Purity:>98% Medchemexpress has over 10000 novel life-science reagents, reference compounds, APIs and natural compounds for laboratory and scientific use. Other quantity can also be offered.