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How Chem Autocomplete chooses which structure cards to show

ChemIllusion explains how its drawing tool combines RDKit-generated structures, Jev's card choices and separate PubChem lookups without asking a language model to invent molecules.

Original by ChemIllusionIntegrations

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Our summary

When someone draws a molecule, Chem Autocomplete offers cards for possible next structures, such as a protected group or a related variation. ChemIllusion explains how the feature prepares these suggestions. It helps with drawing choices; it does not predict reactions or establish that a suggested structure will work scientifically.

RDKit, a chemistry software toolkit, builds candidate structures and screens them before ranking. Jev receives a compact description of the drawing and helps select and order cards through OpenRouter. Its choices include none, so an unsuitable set need not produce a suggestion. PubChem matches arrive separately in the background.

The screening runs on ChemIllusion's server, not solely on the user's device. Information about the drawing goes to a hosted model service. Private Structure Mode controls PubChem lookups, not proven privacy across every service. The creator's reported response times do not establish performance or chemical suitability for other drawings.

Key takeaways

  1. Build and check candidate structures with chemistry software before asking Jev which ones to display.
  2. Include a none option so selection can decline every available card; keep slower database lookups separate.
  3. Distinguish a usable drawing suggestion from a reaction prediction, and check which outside services receive structure information.

The article explicitly identifies a choice question in this feature; other question types are general descriptions of Jev. ChemIllusion reports about a fifth of a second per request and 170 to 300 milliseconds per cycle; these timings were not reproduced. The article and saved product examples were read, but the drawing tool and model were not run. Screening is not a scientific guarantee.

ChemIllusion · Original published

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