You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule 2-[[5-(ethylamino)-1,3,4-thiadiazol-2-yl]sulfanyl]-1-[(2R)-2-methyl-2,3-dihydroindol-1-yl]ethanone ?
user
C15H18N4OS2
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