You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule 2-(7,7a-dihydro-1-benzofuran-2-carbonylamino)-4-(2,4-difluoro-3-hydroxyphenyl)thiophene-3-carboxylic acid ?
user
C20H13F2NO5S
assistant