You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 5-methyl-3-thiophen-2-yl-[1,2,4]triazolo[4,3-c]pyrimidine-7-carboxylic acid by IUPAC nomenclature, provide its molecular formula.
user
C11H8N4O2S
assistant