You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(8S)-2-piperidin-4-ylidene-6-thiatricyclo[8.4.0.03,7]tetradeca-1(14),3(7),4,10,12-pentaen-8-ol is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H19NOS
assistant