OPERA Model Calculation Details: Bioconcentration Factor

Structural image of Methoxyflurane
Chemical Identifiers
Preferred name: Methoxyflurane
DTXSID: DTXSID7025556
DTXCID: DTXCID405556
CASRN: 76-38-0
Molecular weight: 164.96
Model Results
Model name: OPERA_BCF
Model source: OPERA2.8
Property name: Bioconcentration Factor
Property description: Bioconcentration factor: the ratio of the chemical concentration in fish as a result of absorption via the respiratory surface to that in water at steady state
Experimental value: Experimental value from OPERA2.8
 N/A
Predicted value: Predicted value from the model
6.61 L/kg
Confidence level:  Confidence level is calculated from the accuracy of the predictions of the five nearest neighbors weighted by their distance to the query chemical
0.608
Combined applicability domain:  Combined applicability domain from multiple AD measures
Inside training set (
Global AD  Global applicability domain via the leverage approach
= 1) and fair local representation (0.4 ≤
Local AD index Local applicability domain index is relative to the similarity of the query chemical to its five nearest neighbors from the training set
= 0.427 ≤ 0.6)
Model Performance
Bioconcentration Factor Model Results Histogram of Bioconcentration Factor Data
Weighted kNN model statistics
Training (75%) 5-fold CV (75%) Test (25%)
R2 RMSE Q2 RMSE R2 RMSE
0.85 0.53 0.84 0.55 0.83 0.64

Model summary in QSAR Model Reporting Format (QMRF)
Nearest Neighbors from Model Knowledge Base
Neighbor: 1
Measured:  20.0 L/kg
Predicted: Five fold cross validation prediction for the neighbor
 7.76  L/kg

Structural image of Isoprene
Isoprene

 Neighbor: 2
Measured:  1.51 L/kg
Predicted: Five fold cross validation prediction for the neighbor
 12.0  L/kg

Structural image of Methyl tert-butyl ether
Methyl tert-butyl ether

 Neighbor: 3
Measured:  5.01 L/kg
Predicted: Five fold cross validation prediction for the neighbor
 3.63  L/kg

Structural image of tert-Butyl alcohol
tert-Butyl alcohol

 Neighbor: 4
Measured:  15.1 L/kg
Predicted: Five fold cross validation prediction for the neighbor
 9.77  L/kg

Structural image of 1,2-Dibromoethane
1,2-Dibromoethane

 Neighbor: 5
Measured:  5.25 L/kg
Predicted: Five fold cross validation prediction for the neighbor
 7.59  L/kg

Structural image of Thiophene, 3-methyl-
Thiophene, 3-methyl-