Q: Please describe this drug.
 The Compound has the SMILES O=c1[nH]cnc2nc[nH]c12.
Result: A purine and a reaction intermediate in the metabolism of adenosine and in the formation of nucleic acids by the salvage pathway.
{#Question|Q!}: {quest#}
{#Constraint:|Description:|!} The {#Molecule|Compound|Chemical!} {#has the|can be represented with the!} {SMILES__description} {SMILES#}.
{#Answer|Result|Answer!}: {answ#}
O=c1[nH]cnc2nc[nH]c12
C1=NC2=C(N1)C(=O)NC=N2
1,7-dihydropurin-6-one
Please describe this drug.