Task: Answer the following question about the molecule with SMILES Nc1nc2[nH]cnc2c(=S)[nH]1.
Question: Determine if this drug is administered as a racemic mixture, a single stereoisomer, an achiral molecule, or has an unknown chirality.
Answer: An achiral molecule
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
Determine if this drug is administered as a racemic mixture, a single stereoisomer, an achiral molecule, or has an unknown chirality.