You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 7-methyl-10-(1H-pyrazol-5-ylmethyl)-4-(pyridin-2-ylmethyl)-3-thia-5,7,10,11-tetrazatricyclo[6.4.0.02,6]dodeca-1(8),2(6),4,11-tetraen-9-one by IUPAC nomenclature, provide its molecular formula.
user
C18H15N7OS
assistant