bromodeoxyuridine

noun

bro·​mo·​de·​oxy·​ur·​i·​dine ˌbrō-mō-ˌdē-ˌäk-sē-ˈyu̇r-ə-ˌdēn, -dən 

variants or 5-bromodeoxyuridine

ˈfīv- 

: a mutagenic analog C₉H₁₁O₅NBr of thymidine that induces chromosomal breakage especially in heterochromatic regions and has been used to selectively destroy actively dividing cells

—abbreviation BUdR