You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-(2,3,3a,4,5,6,7,7a-octahydroindole-1-carbonyl)-1,3-thiazole-2-carboxylic acid The above is the IUPAC name of a molecule. Write its molecular formula.
user
C13H16N2O3S
assistant