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Novel RNA polymerase I inhibitor, targeting ribosomal DNA G-quadruplexes, potently and selectively inhibiting cell growth by high-affinity binding to G4s in ribosomal DNA, impairing RNA polymerase I (Pol I) elongation, inducing a rapid inhibition of Pol I transcription, nucleolus disruption, proteasome-dependent Pol I catalytic subunit A degradation and autophagy