You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (3R,9bR)-N-[(2S,3S)-1-(2-methoxyethylamino)-3-methyl-1-oxopentan-2-yl]-2,2-dimethyl-5-oxo-3,9b-dihydro-[1,3]thiazolo[2,3-a]isoindole-3-carboxamide by IUPAC nomenclature, provide its molecular formula.
user
C22H31N3O4S
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