Task: Answer the following question about the molecule with SMILES O.S=c1nc[nH]c2nc[nH]c12.
Description: Please describe this drug.
Result: Mercaptopurine hydrate is a hydrate. It contains a mercaptopurine.
Task: Answer the following question about the molecule with {SMILES__description} {SMILES#}.
{#Description|Question|Request!}: {quest#}
{#Result|Answer|Completion!}: {answ#}
O.S=c1nc[nH]c2nc[nH]c12
C1=NC2=C(N1)C(=S)N=CN2.O
3,7-dihydropurine-6-thione;hydrate
Please describe this drug.