You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
methyl 1-[(R)-(2-ethyl-6-hydroxy-[1,3]thiazolo[3,2-b][1,2,4]triazol-5-yl)-(3-methylphenyl)methyl]piperidine-4-carboxylate is the IUPAC name of a molecule. Please give its molecular formula.
user
C21H26N4O3S
assistant