You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule (3R,7aS)-N-(3,4-dihydro-2H-1,5-benzodioxepin-7-yl)-7a-methyl-5-oxo-2,3,6,7-tetrahydropyrrolo[2,1-b][1,3]thiazole-3-carboxamide .
user
C17H20N2O4S
assistant