For students and researchers

A reaction product predictor in your chemistry editor

Draw the reactants and a reaction arrow, and Athanor’s Productum I model proposes the product, right on the canvas. It needs a free arbastro account and never uses AI credits.

An illustration of how it looks in the app. The real results are below.

How it does on textbook reactions

14 reactions from undergraduate labs, sent as reactants and reagents. It gave the textbook product as its first answer 12 times. The misses are shown as misses.

Fischer esterification: ethanol + acetic acid

H₂SO₄

The textbook product, as its first answer, at 96% confidence.

Fischer esterification: isoamyl alcohol + acetic acid

H₂SO₄

The textbook product, as its first answer, at 99.7% confidence.

Aspirin: salicylic acid + acetic anhydride

H₃PO₄

The textbook product, as its first answer, at 98% confidence.

Aldol condensation: benzaldehyde + acetone to dibenzalacetone

NaOH, ethanol The structure O=C(C=Cc1ccccc1)C=Cc1ccccc1

The textbook product, as its first answer, at 85% confidence.

Grignard: phenylmagnesium bromide + benzophenone

ether

The structure OC(c1ccccc1)(c1ccccc1)c1ccccc1

The textbook product, as its first answer, at 97% confidence.

Grignard: phenylmagnesium bromide + carbon dioxide

ether

The textbook product, as its first answer, at 51% confidence.

Wittig: benzaldehyde + benzyltriphenylphosphonium chloride to stilbene

The structure [Cl-].C(c1ccccc1)[P+](c1ccccc1)(c1ccccc1)c1ccccc1

NaOH, CH₂Cl₂ The structure C(=Cc1ccccc1)c1ccccc1

The textbook product, as its first answer, at 89% confidence.

E1 dehydration of cyclohexanol

H₃PO₄

Missed. Its first answer is dicyclohexyl ether, the side product; cyclohexene, the textbook answer, is its third. First answer at 60%.

SN2: 1-butanol + HBr

H₂SO₄

The textbook product, as its first answer, at 50% confidence.

Nitration of methyl benzoate

H₂SO₄

The structure COC(=O)c1cccc([N+](=O)[O-])c1

The textbook product, as its first answer, at 89% confidence.

Reduction: camphor + NaBH₄

methanol

The textbook product, as its first answer, at 94% confidence.

Diels-Alder: anthracene + maleic anhydride

xylene $The structure O=C(O)/C=C\C(=O)O$

Missed. Its first answer is maleic acid, the anhydride opened by water; the Diels-Alder adduct is not in its top three. First answer at 69%.

Acetanilide: aniline + acetic anhydride

The textbook product, as its first answer, at 98% confidence.

Benzocaine: 4-aminobenzoic acid + ethanol

H₂SO₄

The textbook product, as its first answer, at 99% confidence.

Confidence is the model’s own estimate for that answer among the ones it considered, not a measured chance that the reaction works in your flask. Run on November 9, 2026 with Productum I 1.0. Every structure was screened against chemical weapons and controlled-substance lists before it was published.

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