You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[7-[4-[(1,1-dihydroxythian-4-yl)amino]-1-ethylpyrazolo[3,4-b]pyridin-5-yl]-5-oxa-6-azaspiro[3.4]oct-6-en-2-yl]methanol is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H29N5O4S
assistant