You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(7aR)-N-[(1R)-1-(1-adamantyl)ethyl]-5-oxo-2,3,6,7-tetrahydropyrrolo[2,1-b][1,3]thiazole-7a-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H28N2O2S
assistant