Which proton is the most acidic in the compound below? 
Definitions:
Pareto Chart
A graphical representation that identifies the most significant factors in a data set, based on the Pareto principle that 20% of the causes produce 80% of the effects.
ISO 9000
A set of international standards for quality management and quality assurance designed to help companies ensure they meet customer and other stakeholder needs.
Conforming Quality
The degree to which a product or service meets the specified standards and requirements, ensuring customer satisfaction.
Target-oriented Quality
A strategic approach focusing on achieving specific, predefined quality goals to satisfy customer expectations and improve product or service performance.
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