You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(9S,10R)-10-prop-2-ynyltricyclo[9.4.0.03,8]pentadeca-1(15),3,5,7,11,13-hexaen-9-ol is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H16O
assistant