Can someone please tell what this model represents?
The model represents α-D-mannopyranose.
Your model shows a six-membered ring containing an oxygen atom.
Carbon 1 has both an ether and a hydroxyl group. It is part of a hemiacetal group (in the blue rectangle).
There is a hydroxyl group on every carbon, and the hydroxymethyl group on
The compound is the pyranose form of a D-aldohexose.
It may be easier to identify the compound if we "unwrap" the model and draw it as a Fischer projection.
Remember that "down" is to the right and "'up" is to the left in a Fischer projection.
We compare the structure with those of the eight aldohexoses.
Our mnemonic tells us the compound is D-mannose.