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IUPAC2SMILES-canonical-base was designed to accurately translate IUPAC chemical names to SMILES.

Model Details

Model Description

IUPAC2SMILES-canonical-base is based on the MT5 model with optimizations in implementing different tokenizers for the encoder and decoder.

  • Developed by: Knowladgator Engineering
  • Model type: Encoder-Decoder with attention mechanism
  • Language(s) (NLP): SMILES, IUPAC (English)
  • License: Apache License 2.0

Model Sources


Firstly, install the library:

pip install chemical-converters


To perform simple translation, follow the example:

from chemicalconverters import NamesConverter

converter = NamesConverter(model_name="knowledgator/IUPAC2SMILES-canonical-base")
print(converter.iupac_to_smiles(['ethanol', 'ethanol', 'ethanol']))
['CCO', 'CCO', 'CCO']

Processing in batches:

from chemicalconverters import NamesConverter

converter = NamesConverter(model_name="knowledgator/IUPAC2SMILES-canonical-base")
print(converter.iupac_to_smiles(["buta-1,3-diene" for _ in range(10)], num_beams=1, 
                                process_in_batch=True, batch_size=1000))
['<SYST>C=CC=C', '<SYST>C=CC=C'...]

Our models also predict IUPAC styles from the table:

Style Token Description
<BASE> The most known name of the substance, sometimes is the mixture of traditional and systematic style
<SYST> The totally systematic style without trivial names
<TRAD> The style is based on trivial names of the parts of substances

Bias, Risks, and Limitations

This model has limited accuracy in processing large molecules and currently, doesn't support isomeric and isotopic SMILES.

Training Procedure

The model was trained on 100M examples of SMILES-IUPAC pairs with lr=0.00001, batch_size=512 for 2 epochs.


Model Accuracy BLEU-4 score Size(MB)
IUPAC2SMILES-canonical-small 88.9% 0.966 23
IUPAC2SMILES-canonical-base 93.7% 0.974 180
STOUT V2.0* 68.47% 0.92 128
*According to the original paper https://jcheminf.biomedcentral.com/articles/10.1186/s13321-021-00512-4


Coming soon.

Model Card Authors

Mykhailo Shtopko

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