The ester below contains a propoxy group. 
Definitions:
Response Variable
In statistics, the variable that measures an outcome or result of a study, which the researcher aims to predict or explain.
Obstacle Course
An obstacle course is a series of challenging physical barriers that an individual or team must navigate, usually designed for training, military, or sport purposes.
Driving Accuracy
A measure in golf, among other contexts, referring to how often drives land in the fairway.
Lurking Variable
A variable that is not explicitly included in a model but influences both the independent and dependent variables, potentially confounding the results.
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