Which compound is an acetal? 
Definitions:
Set Notation
A mathematical notation used for describing a collection of distinct objects, typically in the form of {a, b, c,...}.
Solution
The value or values that satisfy an equation, inequality, or system of equations.
Absolute Value
The distance of a number from zero on the number line, disregarding whether it is positive or negative.
Set Notation
A system of symbols and terminology used to define and describe sets and their relationships in mathematics.
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