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Stanford Artificial Intelligence Project Papers, Surveys - Online Computation of Molecular Formulas from Mass Number.
Again, we also show identification rates for SIRIUS 3 considering only molecular formulas from PubChem.
Restricting SIRIUS 3 to molecular formulas from PubChem is included for comparison.
We stress that SIRIUS 3 is not restricted to molecular formulas from any database.
We stress again that SIRIUS 3 is not restricted to molecular formulas from any database.
Searching PubChem by precursor mass, and restricting SIRIUS 3 to molecular formulas from PubChem are included for comparison.
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There are surprisingly many chemical structure formats that are unable to guarantee that an algorithm can determine the correct molecular formula from the drawing.
Following generation of phytochemical-like molecular formulae from KNApSAcK via random selection of a derivatization method, simulated m/z values were searched against the KNApSAcK and PubChem databases, employing accuracies of mass analysis and search thresholds corresponding to FT-MS (σ = 1 Da and Δthres = 2 Da) and TOF-MS (σ = 5 Da and Δthres = 10 Da).
The checkCIF validation tests may also return Hirshfeld rigid-bond test errors, which also necessitates additional experimental data such as a molecular formula from HRMS or EA in order to confidently model the structure.
We assume that we can identify the correct molecular formula from the data: limiting candidate molecular formulas to those present in KEGG (Kanehisa and Goto, 2000), which is used for searching molecular structures below, the best scoring fragmentation tree identified the correct molecular formula of the compound in 97.1% (96.0%) of the cases for the METLIN (MassBank) dataset.
Rodgers et al[139] showed that enrichment with 99%13CC isotopes reduces the number of possible molecular formulas for a 851 Da phospholipid from 394 to one.
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