[{"from": "human", "value": "What can you tell me about this molecule? [C][=C][C][=Branch1][=Branch1][=C][N][=C][Ring1][=Branch1][C][=Branch1][C][=O][N]"}, {"from": "gpt", "value": "The molecule is the active form of vitamin B3 and a component of the coenzyme nicotinamide adenine dinucleotide (NAD). Niacinamide acts as a chemo- and radio-sensitizing agent by enhancing tumor blood flow, thereby reducing tumor hypoxia.  This agent also inhibits poly(ADP-ribose) polymerases, enzymes involved in the rejoining of DNA strand breaks induced by radiation or chemotherapy."}]