Q: What is the first recorded year of approval for this drug?
Constraint: The Chemical can be represented with the SMILES NC(=O)CC[C@H](N)C(=O)O.
Result: 2004
{#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)CC[C@H](N)C(=O)O
NC(=O)CC[C@H](N)C(=O)O
(2S)-2,5-diamino-5-oxopentanoicacid
What is the first recorded year of approval for this drug?