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Novel 7-Substituted Camptothecins with Potent Antitumor ActivityDallavalle, Sabrina; Delsoldato, Tatiana; Ferrari, Anna; Merlini, Lucio; Penco, Sergio; Carenini, Nives; Perego, Paola; De Cesare, Michelandrea; Pratesi, Graziella; Zunino, Franco · Journal of Medicinal Chemistry · 2000