You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[ethyl-[3-[[2-(2-hydroxy-2-thiophen-2-ylethyl)pyrrolidine-1-carbonyl]amino]cyclobutyl]amino]acetic acid The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H29N3O4S
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