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Draw one of the stereoisomers formed in the reaction below.
(https://biology-forums.com/gallery/45/1122469_01_12_22_5_02_38.jpeg) (https://biology-forums.com/index.php?action=gallery;sa=view&id=45990)

Hi

This should help

In first step the alkene and the NBS reacts to form a cyclic boromonium ion in the polar solvent DMSO, which can stabilize charged species.

{see attachment 1}

In step 2, the water molecule come from the bottom face of the intermediate bromonium ion and gives the trans product.

{see attachment 2}