Task: Please answer the following question about the molecule with SMILES Cn1c(=O)c2c(ncn2C)n(C)c1=O.O=C(O)CC(O)(CC(=O)O)C(=O)O.
Question: What is the first recorded year of approval for this drug?
Completion: 1999
Task: Please answer the following question about the molecule with {SMILES__description} {SMILES#}.
{#Description|Question|Request!}: {quest#}
{#Result|Answer|Completion!}: {answ#}
Cn1c(=O)c2c(ncn2C)n(C)c1=O.O=C(O)CC(O)(CC(=O)O)C(=O)O
Cn1c(=O)c2c(ncn2C)n(C)c1=O.O=C(O)CC(O)(CC(=O)O)C(=O)O
2-hydroxypropane-1,2,3-tricarboxylic acid;1,3,7-trimethylpurine-2,6-dione
What is the first recorded year of approval for this drug?