You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(5-aminothieno[2,3-c]pyridazin-6-yl)-[3-(1-hydroxyethyl)pyrrolidin-1-yl]methanone is the IUPAC name of a molecule. Please give its molecular formula.
user
C13H16N4O2S
assistant