You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 1-[(1S,2R)-1-(4-ethylpiperazine-1,4-diium-1-yl)-1-thiophen-2-ylpropan-2-yl]-3-(4-fluorophenyl)thiourea into its molecular formula.
user
C20H29FN4S2+2
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