You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (1R,6S)-6-(4-chlorophenyl)-4-methyl-1-[[(Z)-thiophen-2-ylmethylideneamino]carbamoyl]cyclohex-3-ene-1-carboxylic acid by IUPAC nomenclature, provide its molecular formula.
user
C20H19ClN2O3S
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