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Table 4 Failed IUPAC-name-to-SMILES translations

From: STOUT: SMILES to IUPAC names using neural machine translation

IUPAC names Reason for failure (OPSIN error messages)
1. N-[6-(2,3-diaminopropylidene)-1-methyl-1,2,4a,5,6,8a-hexahydroquinolin-6-yl]-N-methylpropanamide Atoms are in an unphysical valency state. Element: C valency: 5
2. 2-[({[(3-ethoxypropyl)amino]({[2-(2-fluorophenyl)ethyl]amino})methylidene}amino)-N,N-dimethylacetamide Unmatched opening bracket found
3. 3'-(propan-2-yl)-2',3',4',5',6',7',8',8'a-octahydro-2'H-spiro[imidazole-4,1'-indolizin]-2-amine The following being uninterpretable: 2',3',4',5',6',7',8',8'
4. ({2',6'-difluoro-2',6'-dimethyl-[1,1'-biphenyl]-4-yl}methyl)(propyl)amine Failed to assign all double bonds
5. 1,4,5-trimethyl-1-[1,2-dimethylpropyl)-2-methyl-1-propylbicyclo[12.2.1]tetradeca-1,5-diene Disagreement between lengths of bridges and alkyl chain length