pyrimidine,cytosine

structure of pyrimidine
111129-64-7 (5-ethylpyrimidine-4,6-diol)
2,4-difluoro-5-(3-(trifluoromethoxy)phenyl)pyrimidine
1233198-67-8 (2-hydroxypyrimidine-5-carboxamide)
2-chloro-5-[(1-methylpiperidin-4-yl)methoxy]pyrimidine