Question: What is the first recorded year of approval for this drug?
Constraint: The Chemical can be represented with the SMILES NC(=O)NC(=O)Cc1ccccc1.
Result: 1951
{#Question|Q!}: {quest#}
{#Constraint:|Description:|!} The {#Molecule|Compound|Chemical!} {#has the|can be represented with the!} {SMILES__description} {SMILES#}.
{#Answer|Result|Answer!}: {answ#}
NC(=O)NC(=O)Cc1ccccc1
NC(=O)NC(=O)Cc1ccccc1
N-carbamoyl-2-phenylacetamide
What is the first recorded year of approval for this drug?