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\setatomsep{1.8em}
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\chemfig[atom sep=1.8em]{<molecule code>}
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\setchemfig{atom sep=1.8em}
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\setatomsep{1.8em}
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\chemfig[atom sep=1.8em]{<molecule code>}
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\setchemfig{atom sep=1.8em}
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