Task: Answer the following question about the molecule with SMILES O=c1[nH]c2cc(Cl)ccc2o1.
Description: What is the first recorded year of approval for this drug?
Completion: 1958
Task: Answer the following question about the molecule with {SMILES__description} {SMILES#}.
{#Description|Question|Request!}: {quest#}
{#Result|Answer|Completion!}: {answ#}
O=c1[nH]c2cc(Cl)ccc2o1
O=c1[nH]c2cc(Cl)ccc2o1
5-chloro-3H-1,3-benzoxazol-2-one
What is the first recorded year of approval for this drug?