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 methyl 4,5-dimethyl-2-[[(3R)-7-methyl-1-oxo-3,4-dihydroisochromene-3-carbonyl]amino]thiophene-3-carboxylate ?
user
C19H19NO5S
assistant