Question: Please describe this drug.
Constraint: The Molecule can be represented with the SMILES O.S=c1nc[nH]c2nc[nH]c12.
Answer: Mercaptopurine hydrate is a hydrate. It contains a mercaptopurine.
{#Question|Q!}: {quest#}
{#Constraint:|Description:|!} The {#Molecule|Compound|Chemical!} {#has the|can be represented with the!} {SMILES__description} {SMILES#}.
{#Answer|Result|Answer!}: {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.