You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 2-[2-[[2-(2,3-dihydro-1H-inden-1-yl)acetyl]amino]ethyl]-4-methyl-1,3-thiazole-5-carboxylic acid by IUPAC nomenclature, provide its molecular formula.
user
C18H20N2O3S
assistant