You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(4Z,9Z,11Z)-2,7-dimethyl-8-methylidene-7-sulfanyltrideca-2,4,9,11-tetraene-3,11-diol is the IUPAC name of a molecule. Please give its molecular formula.
user
C16H24O2S
assistant