You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance 3-amino-N-(2,3-dihydro-1,4-benzodioxin-6-yl)-7-methylthieno[2,3-b]quinoline-2-carboxamide .
user
C21H17N3O3S
assistant