Question: What is the molecular weight of this compound's parent molecule?
 The Molecule has the SMILES O=c1c2ccccc2[se]n1-c1ccccc1.
Answer: 274.18
{#Question|Q!}: {quest#}
{#Constraint:|Description:|!} The {#Molecule|Compound|Chemical!} {#has the|can be represented with the!} {SMILES__description} {SMILES#}.
{#Answer|Result|Answer!}: {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?