Task: Answer the following question about the molecule with SMILES Nc1nc2[nH]cnc2c(=S)[nH]1.
Question: What is the first recorded year of approval for this drug?
Result: 1966
Task: Answer the following question about the molecule with {SMILES__description} {SMILES#}.
{#Description|Question|Request!}: {quest#}
{#Result|Answer|Completion!}: {answ#}
Nc1nc2[nH]cnc2c(=S)[nH]1
Nc1nc2[nH]cnc2c(=S)[nH]1
2-azanyl-1,9-dihydropurine-6-thione
What is the first recorded year of approval for this drug?