Task: Answer the following question about the molecule with SMILES O=c1c2ccccc2[se]n1-c1ccccc1.
Request: What is the molecular weight of this compound's parent molecule?
Result: 274.18
Task: Answer the following question about the molecule with {SMILES__description} {SMILES#}.
{#Description|Question|Request!}: {quest#}
{#Result|Answer|Completion!}: {answ#}
O=c1c2ccccc2[se]n1-c1ccccc1
O=c1c2ccccc2[se]n1-c1ccccc1
2-phenyl-1,2-benzoselenazol-3-one
What is the molecular weight of this compound's parent molecule?