You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
ethyl N-[(3S)-1-[(2R,3R,4R,5R)-2-(5-amino-2-oxo-[1,3]thiazolo[4,5-d]pyrimidin-3-yl)-4-hydroxy-5-(hydroxymethyl)oxolan-3-yl]-4-methyl-2-oxopentan-3-yl]carbamate is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H27N5O7S
assistant