You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (2R)-N-cyclopropyl-2-[[5-(2-methylfuran-3-yl)-4-prop-2-enyl-1,2,4-triazol-3-yl]sulfanyl]-2-phenylacetamide by IUPAC nomenclature, provide its molecular formula.
user
C21H22N4O2S
assistant