Task: Please answer the following question about the molecule with SMILES Oc1nc(O)c2cn[nH]c2n1.
Question: Please provide a description of this drug's mechanism of action.
Completion: Xanthine dehydrogenase inhibitor
Task: Please answer the following question about the molecule with {SMILES__description} {SMILES#}.
{#Description|Question|Request!}: {quest#}
{#Result|Answer|Completion!}: {answ#}
Oc1nc(O)c2cn[nH]c2n1
Oc1nc(O)c2cn[nH]c2n1
1H-pyrazolo[3,4-d]pyrimidine-4,6-diol
Please provide a description of this drug's mechanism of action.