C-1311 is an imidazoacridinone analog. It is a next-generation investigational anticancer drug. It is an antitumor inhibitor of topoisomerase II and FMS-like tyrosine kinase 3 receptor. It was evaluated in phase I and II clinical trials for the treatment of various types of tumors. Mild treatment-related adverse events were thrombocytopenia, anemia, nausea, vomiting and diarrhea. Serious adverse event is neutropenia.