You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 2-[1-(5,6-dihydro-4H-cyclopenta[b]thiophen-2-ylmethylamino)ethyl]benzene-1,3-diol by IUPAC nomenclature, provide its molecular formula.
user
C16H19NO2S
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