You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[(2-cyclopentyl-1,3-thiazol-4-yl)methyl]-[1,2,4]triazolo[4,3-a]pyridin-3-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C15H16N4OS
assistant