Quarfloxin

**Semantic type:** Pharmacologic Substance

**Definition:** A fluoroquinolone derivative with antineoplastic activity. Quarfloxin disrupts the interaction between the nucleolin protein and a G-quadruplex DNA structure in the ribosomal DNA (rDNA) template, a critical interaction for rRNA biogenesis that is overexpressed in cancer cells; disruption of this G-quadruplex DNA:protein interaction in aberrant rRNA biogenesis may result in the inhibition of ribosome synthesis and tumor cell apoptosis.

**Synonyms:** - 3H-Benzo(b)pyrido(3,2,1-kl)phenoxazine-2-carboxamide, 5-fluoro-N-(2-((2S)- 1-methyl-2-pyrrolidinyl)ethyl)-3-oxo-6-(3-pyrazinyl-1-pyrrolidinyl)- - 5-Fluoro-N-(2-((2S)-1-methylpyrrolidin-2-yl)ethyl)-3-oxo-6-(3-(pyrazin-2- yl)pyrrolidin-1-yl)-3H-benzo(b)pyrido(3,2,1-kl)phenoxazine-2-carboxamide - CX-3543 - QUARFLOXIN - Quarfloxacin