You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 2-[2-(4-tert-butyl-1,3-thiazol-2-yl)ethyl]-1-ethyl-3-(2-propan-2-yl-5,6,7,8-tetrahydro-[1,2,4]triazolo[1,5-a]pyridin-6-yl)guanidine by IUPAC nomenclature, provide its molecular formula.
user
C21H35N7S
assistant