ACD/HNMR Predictor

What's New

Version 10.0 to 11.0

• New algorithm improvements using a combined approach of:
  • HOSE code
  • Neural network
  • Increments
• Improved prediction for stereochemistry
• Internal database expansions
  • Predictions are now based on 1,666,199 ¹H chemical shifts
• Prediction of heteronuclear couplings
• Creation of multi-structure records

Download a PDF copy of the expanded details on What's New with ACD/HNMR Predictor, or contact your Account Manager or Distributor.

Version 9.0 to 10.0

• Predictions are now based on 1,578,000 ¹H chemical shifts.
• New neural network prediction algorithm has been added.
• Ability to retain existing assignments when updating existing chemical structures in a training database.
• ACD/CNMR and HNMR Predictors now share the same interface if both applications are installed.

Version 7.0 to 8.0

Content/Library

• Expanded database of experimental values for ¹H NMR prediction
  • Over 1,384,000 chemical shifts and 449,000 coupling constants

Algorithm

• Solvent specific prediction
  • Calculate ¹H NMR spectra in different solvents (choose from a list)

Databasing

• Search a substructure with a predefined location of the chemical shift or value
  • Substructure search conditions also include coupling constants
• Sort the chemical shift search results by Hit Quality Index (HQI)
• Search spin-system chemical shifts
  • Search chemical shifts that are next to each other

Visualization

• Save a spectrum without attaching a chemical structure
  • Exclude a chemical structure so a spectrum can be used as a teaching tool

Version 6.0 to 7.0

Display

• Plot Experimental vs. Calculated chemical shift
  • View the accuracy of any database quickly and easily
• Display average experimental value along with the predicted value
  • Set-up a custom table to compare with the predicted data
• Include values like DB Hits, Experimental Average, Weighted Average, etc.
• Display couplings for exchangeable protons in the table
  • Turn option off to merge multiplets
• Easily identify labile protons in shift tables
  • Customize display with bold or colored font for NH or OH for proton shifts

Algorithm

• Automatically detect tautomers prior to prediction
  • Know if the structure is the most favorable
  • Predict the spectrum of a mixture of tautomers
• Structure is automatically searched for in the database before a prediction is performed
  • Know if the structure is already in the database
  • Browse the database hits before deciding whether or not to predict the spectrum

Content/Library

• Prediction databases expanded
  • An additional 15,000 entries in HNMR DB
  • HNMR DB is now 155,600+

Regulatory

• Keep track of which DBs were used for each prediction
  • Audit trail records the details in a .HSP, .SK2, or .PDF file

Databasing

• Create complex Boolean search queries
  • Expanded list of search conditions also includes Exists, Equals To, More Than, Less Than, and In Range

Visualization

• Adjust vertical scale with the PageUp/PageDn and Ctrl-PageUp/Ctrl-PageDn keys