molecule representation format: 1D SMILES
will further encode into 2D graph features
We filtered out overlapping samples from the original train-split (test-set: MolInstruct-Retrosynthesis Prediction)
We only include single-step retrosynthesis prediction.
For Detail, refer to PRESTO: Progressive Pretraining Enhances Synthetic Chemistry Outcomes:
https://arxiv.org/pdf/2406.13193