4-Bromoisoquinoline1532-97-430 % similar 5-Chlorouracil1820-81-130 % similar Quinazolinone491-36-130 % similar 4-Bromopyrimidine31462-56-330 % similar 4-Hydroxypyrimidine4562-27-030 % similar 4(3H)-Pyrimidinone51953-17-430 % similar