You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-cyclopropyl-5-(3-methyl-2,3,3a,4,5,6,7,7a-octahydroindol-1-yl)-1,2,4-thiadiazole The above is the IUPAC name of a molecule. Write its molecular formula.
user
C14H21N3S
assistant