Antitumor agent-192 (Compound 2f) is a β-carboline antitumor agent. Antitumor agent-192 induces autophagy in HCT116 cells via the ATG5/ATG7 pathway. Antitumor agent-192 has an IC 50 of less than 5 μM for human tumor cell lines and significantly inhibits tumor development and reduces tumor weight in a mouse colorectal cancer model transplanted with allografts.