Given the structure of D-altrose below, draw the structure of L-altrose. 
Definitions:
Subarachnoid Space
The area between the arachnoid membrane and pia mater around the brain and spinal cord, filled with cerebrospinal fluid.
Meninges
The three layers of protective tissue, the dura mater, arachnoid mater, and pia mater, that enclose the brain and spinal cord.
Arachnoid Mater
A delicate membrane, one of the three layers of the meninges, located between the dura mater and the pia mater, surrounding the brain and spinal cord.
Central Sulcus
A prominent groove on the surface of the brain, separating the frontal and parietal lobes.
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