Perform the indicated operations and simplify the expression. 
Definitions:
Open-Chain Form
Describes a molecular structure that consists of atoms connected in a linear or branched sequence, rather than a closed ring.
Fischer Projection
A method to represent the three-dimensional structure of molecules, such as carbohydrates and amino acids, on a two-dimensional plane using crossed lines.
L-Allose
A rare sugar belonging to the aldohexose family, known for its potential health benefits but is not widely found in nature.
D-Glyceraldehyde
A simple sugar that serves as a reference molecule for determining the stereochemistry of carbohydrates, representing the D configuration of carbohydrates.
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