You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule [11-methyl-4-(pyridin-3-ylmethyl)-3,4,8,11-tetrazatricyclo[8.3.0.02,6]trideca-1(10),2,5,12-tetraen-8-yl]-thiophen-3-ylmethanone into molecular formula.
user
C21H19N5OS
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