[{"from": "human", "value": "Describe this molecule. [C][=N][N][=C][Branch1][Ring2][S][Ring1][Branch1][N][C][#N]"}, {"from": "gpt", "value": "The molecule is an inhibitor of inosine monophosphate dehydrogenase with activity against several influenza A and B viruses. Amitivir inhibits the conversion of inosine monophosphate to xanthosine monophosphate, the rate-limiting step in the de novo biosynthesis of guanine nucleotides, leading to inhibition of cell proliferation."}]